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Northern Virginia population growth, minority-majority transition, foreign born population transformation, and more demographics, data and graphs by region and county. Analyzed by the Northern Virginia Regional Commission (NVRC). Population Overall Population of Northern Virginia Data Northern Virginia is on the front lines of a demographic transformation shaping the United States. There has been an extraordinary amount of population growth in Northern Virginia. The April 1st Decennial Census population of Northern Virginia was 1,466,350 in 1990, 1,815,197 in 2000, 2,230,623 in 2010, and 2,550,377 in 2020. On July 1, 2025 the Northern Virginia population was estimated to be 2,628,004. Detailed information on the region and its counties and cities are available on the following population topics . Population Total Migration Births/Deaths Foreign Born Race and Ethnicity

Northern Virginia town economically disadvantaged populations, poverty, free and reduced price school meal (FARM) student and more demographics, data and graphs. Analyzed by the Northern Virginia Regional Commission (NVRC). Economically Disadvantaged Overall Reports, maps, and charts are best viewed on a desktop or tablet. Economically Disadvantaged of Northern Virginia While Northern Virginia is known for having communities with some of the highest median incomes in the United States, we must recognize that there are segments of the community in need of assistance that live in one of the most prosperous regions in the country. Poverty The Northern Virginia region has some of the highest household incomes in the United States. However, there are persons in poverty in the region, and their needs must be recognized and addressed. The poverty rates of all counties and cities in Northern Virginia are shown in the following graphs. The poverty rate is the ratio of the number of persons in poverty divided by the number of persons for whom poverty status was determined. Not everyone had their poverty status determined so this figure will be less than the total population. About the Data and Proper Data Interpretation Poverty data is sourced from the U.S. Census Bureau 2000 Census and the American Community Survey (ACS). It is important to note that any data sourced from the ACS is based on a small sample of the population of a place. Areas with smaller populations, such as the cities of Northern Virginia, may have a larger margin of error in the data due to the survey sample size being small. This is less of an issue the larger the population. The margin of error is shown in the popup that is displayed when hovering over a bar in the bar charts. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and is not considered statistically significant. In addition to the margin of error, the accuracy of the American Community Survey data for an area can be gaged by evaluating the trend. If the data has a clear trend then the data from one period to the next can be deemed reliable Poverty Rate - Current Five-Year Estimates Northern Virginia's poverty rate is 6.0%, compared to 9.9% for Virginia and 12.5% for the nation according to the U.S. Census Bureau American Community Survey. All jurisdictions in the United States are included in the five-year American Community Survey estimates. Out of all 3,144 jurisdictions in the USA, two of the fifteen lowest poverty rates are located in the Northern Virginia localities of Falls Church (8th) and Loudoun County (12th). Loudoun County and Falls Church are also the 1stt and 11th ranked for median household income, respectively. However, there are persons in poverty in Loudoun, Falls Church, and the rest of the region, and their needs must be recognized and addressed. Poverty Rate - Current One-Year Estimates Those jurisdictions with a population of 65,000 or more are included in the one-year American Community Survey estimates. The poverty rates for the five largest jurisdictions in Northern Virginia are shown in this graph. The Northern Virginia regional poverty rate was 6.1% in 2024, which is nearly half the poverty rate of the nation. Out of the 850 jurisdictions with a population of 65,000 or more in the USA, one of the twenty lowest poverty rates is located in the Northern Virginia locality of Loudoun County (20th). Loudoun County is also the number one ranked for median household income. However, there are persons in poverty in Loudoun and the rest of the region and their needs must be recognized. Poverty Rate - Historic Compared to Current Five-Year Estimates Northern Virginia's poverty rate has experienced a similar pattern to the Commonwealth of Virginia and the United States over time. From 1999 to the 2010-2014 period there was an increase in the percent of persons in poverty. The rate in poverty has gradually lessened since the 2010-2014 period, reaching 6.0% in the 2020-2024 period. Poverty Rate - Historic Compared to Current One-Year Estimates The poverty rate patterns over time, for the regions large jurisdictions (population of 65,000 or more), are shown in the following graph. The Northern Virginia regional poverty rate, for the one-year estimates, represents the five largest jurisdictions in Northern Virginia only. The persons in poverty data has large year-to-year fluctuations due to the small sample size of the survey, together with the small amount of persons in poverty. The margins of error (displayed in the graph pop-ups), are large for the poverty one-years estimates, making any poverty trends undiscernible. However, the low to high ranges of poverty over time for each jurisdiction and the region, and comparisons between jurisdictions and the region can be gleaned. For instance, Northern Virginia's poverty rate has ranged from approximately 6% to 7% between 2010 and 2024, and Loudoun County’s poverty rate has been consistently lower than the other large jurisdictions. Given the unreliability of single-year poverty estimates, utilization of five-year estimates are strongly recommended for all Northern Virginia jurisdictions and the region when analyzing trends, planning, and developing policies. The American Community Survey 5-year estimates have a significantly larger sample size.

Northern Virginia income, economically disadvantage populations, workforce, and more demographics, data and graphs by region and county. Analyzed by the Northern Virginia Regional Commission (NVRC). Economics Overall Economics of Northern Virginia Data What is it that sets Northern Virginia apart from other places, that gives Northern Virginia its competitive edge, that makes it such a unique, dynamic and interesting place? It’s unparalleled human capital, the people who live here, work here, and come here from all corners of the globe. Proximity to the nation’s capital has transformed Northern Virginia and the entire Washington, D.C. metropolitan area into one of America’s — and the world’s — most dynamic, fastest growing, economically advanced, highly-educated, prosperous, and culturally-diverse regions on the planet. The region has some of the top, most renowned public school systems in the nation. The quality of education in the region's public school systems draws numerous amounts of families to the region. The demographic, social, and economic profile of this region shows it. Median Household Income Household Income Distribution Economically Disadvantaged Safety Net Participants Workforce

Northern Virginia population growth, minority-majority transition, foreign born population transformation, and more demographics, data and graphs by region and county. Analyzed by the Northern Virginia Regional Commission (NVRC). People / Population Information on the people of the overall Northern Virginia region and it's county and cities. Overall Information on the people of Northern Virginia's incorporated towns . Towns

Northern Virginia educational attainment, public school student enrollment, and more demographics, data and graphs by region and county. Analyzed by the Northern Virginia Regional Commission (NVRC). Educational Attainment Overall Reports, maps, and charts are best viewed on a desktop or tablet. Educational Attainment of Northern Virginia Overview Northern Virginia localities are home to some of the most highly educated residents in the nation. This high education level of the region's citizens creates a strong, flourishing business community. The percentage of Northern Virginia's population age 25 or more holding a bachelor's or higher degree is 61.9%, which is nearly double the United States, and holding a graduate or professional degree is 30.2%, which is more than double the United States. About the Data and Proper Data Interpretation Educational attainment data is sourced from the U.S. Census Bureau 2000 Census and the American Community Survey (ACS). It is important to note that any data sourced from the ACS is based on a small sample of the population of a place. Areas with smaller populations, such as the cities of Northern Virginia, may have a larger margin of error in the data due to the survey sample size being small. This is less of an issue the larger the population. The margin of error is shown in the popup that is displayed when hovering over a bar in the bar charts. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and is not considered statistically significant. In addition to the margin of error, the accuracy of the American Community Survey data for an area can be gaged by evaluating the trend. If the data has a clear trend then the data from one period to the next can be deemed reliable. Educational Attainment - Current Bachelor's or Higher Degrees - Current Five-Year Estimates All jurisdictions in the United States are included in the five-year American Community Survey estimates. The percentage of residents age 25 or older with bachelor's or higher degrees, for all jurisdictions in Northern Virginia, are displayed in the following graph. Out of all 3,144 jurisdictions in the USA, six of the twenty highest ranked for the percentage of residents age 25 or older with bachelor's or higher degrees are located in Northern Virginia. Those include the City of Falls Church (1st), Arlington County (2nd), the City of Alexandria (4th), Fairfax County (5th), Loudoun County (8th), and Fairfax City (16th). Overall, Northern Virginia's share is 61.9% for residents age 25 or older with bachelor's or higher degrees, which is signicantly higher than Virginia and nearly twice the USA. Bachelor's or Higher Degrees - Current One-Year Estimates Those jurisdictions with a population of 65,000 or more are included in the one-year American Community Survey estimates, of which there are five Northern Virginia jurisdictions included. The share of residents age 25 or older with bachelor's or higher degrees for the five largest jurisdictions in Northern Virginia are shown in this graph. The Northern Virginia regional data, for the one-year estimates, is representative of the five largest jurisdictions in Northern Virginia only. Out of the 850 jurisdictions with a population of 65,000 or more in the USA, four of the top seven for the percentage of residents age 25 or older with bachelor's or higher degrees are located in Northern Virginia. Those include Arlington County (1st), the City of Alexandria (2nd), Fairfax (4th), and Loudoun (7th). Graduate or Professional Degrees - Current Five-Year Estimates All jurisdictions in the United States are included in the five-year American Community Survey estimates. The percentage of residents age 25 or older with graduate or professional degrees, for all jurisdictions in Northern Virginia, are displayed in the following graph. Out of all 3,144 jurisdictions in the USA, six of the twenty highest ranked in the percentage of residents age 25 or older with graduate or higher degrees are located in Northern Virginia. Those include the City of Falls Church (1st), Arlington County (3rd), the City of Alexandria (6th), Fairfax County (11th), City of Fairfax (18th), and Loudoun County (19th). Overall, Northern Virginia's share is 30.2% for residents age 25 or older with graduate or professional degrees, which is nearly double Virginia and more than double the USA. Graduate or Professional Degrees - Current One-Year Estimates Those jurisdictions with a population of 65,000 or more are included in the one-year American Community Survey estimates. The percentage of residents age 25 or older with graduate or professional degrees for the five largest jurisdictions in Northern Virginia are shown in this graph. The Northern Virginia regional data, for the one-year estimates, is representative of the five largest jurisdictions in Northern Virginia only. Out of the 850 jurisdictions with a population of 65,000 or more in the USA, four of the 25 highest ranked for the percentage of residents age 25 or older with graduate or professional degrees are located in Northern Virginia. Those include Arlington (1st), the City of Alexandria (3rd), Fairfax (9th), and Loudoun (21st). Educational Attainment - Historic Compared to Current Bachelor's or Higher Degrees - Historic Compared to Current Five-Year Estimates Northern Virginia is one of the most educated places in the United States. Since 2000, the region's population has experienced an upward trend in the share of persons age 25 and older , becoming even more highly educated than it already was. Northern Virginia's age 25 and older population holding bachelor's or higher degrees in 2000 was 50.7% and in the 2020-2024 period was 61.9%, compared to the United States which was 24.4% and 35.7% respectively. The considerable growth of the highly educated contributes to a flourishing and robust business community in Northern Virginia. Bachelor's or Higher Degrees - Historic Compared to Current One-Year Estimates The trend in persons age 25 and older holding a bachelor's or higher degree, for the regions large jurisdictions (population of 65,000 or more), are shown in the following graph. The Northern Virginia regional data, for the one-year estimates, is representative of the five largest jurisdictions in Northern Virginia only. Graduate or Professional Degree - Historic Compared to Current Five-Year Estimates Northern Virginia's age 25 and older population holding professional and graduate degrees in 2000 was 22.1% and in the 2020-2024 period it was 30.2%, compared to the United States which was 8.9% and 14.1% respectively. The considerable growth of the highly educated contributes to a flourishing and robust business community in Northern Virginia. Graduate or Professional Degree - Historic Compared to Current One-Year Estimates The trend in persons age 25 and older holding a graduate or professional degree, for the regions large jurisdictions (population of 65,000 or more), are shown in the following graph. The Northern Virginia regional data, for the one-year estimates, is representative of the five largest jurisdictions in Northern Virginia only.

Northern Virginia towns educational attainment, public school student enrollment, and more demographics, data and graphs by region and county. Analyzed by the Northern Virginia Regional Commission (NVRC). Educational Attainment of Towns Reports, maps, and charts are best viewed on a desktop or tablet. Educational Attainment of Towns Overview Northern Virginia localities are home to some of the most highly educated residents in the nation. This high education level of the region's citizens creates a strong, flourishing business community. The percentage of Northern Virginia's population age 25 or more holding a bachelor's or higher degree is 61.9%, which is nearly double the United States, and holding a graduate or professional degree is 30.2%, which is more than double the United States. About the Data and Proper Data Interpretation Educational attainment data is sourced from the U.S. Census Bureau 2000 Census and the American Community Survey. All of the incorporated towns in Northern Virginia have a population of less than 65,000 persons. One-year ACS estimates do not exist for incorporated places with a population of less than 65,000. All incorporated towns and places in the United States are included in the five-year ACS estimates. It is important to note that any data sourced from the ACS is based on a small sample of the population of a place. The ACS estimates for places with smaller populations such as Clifton, Dumfries, Hamilton, Haymarket, Hillsboro, Lovettsville, Middleburg, and Quantico can be unreliable if the margin of error is large. The margin of error is shown in the popup that is displayed when hovering over a bar in the bar charts. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is not considered statistically significant and is likely due to statistical sampling error. In addition to the margin of error, the accuracy of the American Community Survey data for an area can be gaged by evaluating the trend. If the data has a clear trend then the data from one period to the next can be deemed reliable. Educational Attainment - Current Bachelor's or Higher Degrees - Current The population age 25 or over with bachelor's or higher degrees of the counties, cities, and incorporated towns in Northern Virginia is shown in this graph. All towns, except for Dumfries, have higher percentages of bachelor's or higher degree holders than the United States and Commonwealth of Virginia. The towns of Clifton and Vienna have higher percentages of bachelor's or higher degree holders than Northern Virginia overall. Graduate or Professional Degrees - Current The population age 25 or over with graduate or professional degrees of the counties, cities, and incorporated towns in Northern Virginia is shown in this graph. The towns of Clifton and Vienna have higher percentages of graduate or professional degree holders than Northern Virginia overall. Educational Attainment - Historic Compared to Current Bachelor's or Higher Degrees - Historic Compared to Current The trend over time in the population age 25 or over with bachelor's or higher degrees in Northern Virginia and its incorporated towns are shown in this graph. Due to the small size of many towns, the educational attainment data of towns should be used with caution and the margin of error of the educational attainment data should be taken into consideration. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and the data should be used with caution. Graduate or Professional Degree - Historic Compared to Current The trend over time in the population age 25 or over with graduate or professional degrees in Northern Virginia and its incorporated towns are shown in this graph. Due to the small size of many towns, the educational attainment data of towns should be used with caution and the margin of error of the educational attainment data should be taken into consideration. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and the data should be used with caution.

Northern Virginia Coronavirus (COVID-19) vulnerable population analysis and maps. Track cases and testing of vulnerable populations and communities in Virginia and the Northern Virginia region. Find analysis, data, maps, demographics, dashboards, and story maps. - Northern Virginia Regional Commission (NVRC). Coronavirus Vulnerable Populations Reports, maps, and charts are best viewed on a desktop or tablet. Social Vulnerability The U.S. Center for Disease Control's (CDC) 2018 Social Vulnerability Index (SVI) indicates the relative social vulnerability of every Virginia census tract. Social vulnerability is a measure of an area's resilience when confronted by disease outbreaks like the coronavirus (COVID-19) and stress on human nature such as natural or man-made disasters. The SVI can be used by governments and non-government entities to identify communities that may need support. Click on image to go to dashboard Senior Population The senior population has been one of the most vulnerable population in the coronavirus (COVID-19) epidemic. The senior population data and maps are a resource for government and non-government entities to identify communities in Virginia and the Northern Virginia region that may need support. Click on image to go to dashboard Immigrant Population The Immigration Study Dashboard provides a report published on October 21, 2020 that details the role of immigrants in Northern Virginia during the Covid-19 pandemic as well as the impact that the pandemic has had on the immigrant community. The immigrant population is especially vulnerable to gaps in our social safety nets. Understanding this population in Northern Virginia helps better inform local leaders as they aim to implement inclusive emergency response policies. Click on image to download a copy of the report

Northern Virginia town income, economically disadvantage populations, and more demographics, data and graphs. Analyzed by the Northern Virginia Regional Commission (NVRC). Economics of Towns Economics of Towns Data There are 14 incorporated towns in Northern Virginia. For comparative purposes, Northern Virginia counties and cities, Commonwealth of Virginia, and United States data are provided in the graphs. About the Data and Proper Data Interpretation The economic data of incorporated towns is sourced from the 2000 Census and the American Community Survey (ACS). All of the incorporated towns in N orthern Virginia have a population of less than 65,000 persons. One-year ACS estimates do not exist for incorporated places with a population of less than 65,000. All incorporated towns and places in the United States are included in the five-year ACS estimates. It is important to note that any data sourced from the ACS is based on a small sample of the population of a place. The ACS estimates for places with smaller populations such as Clifton, Dumfries, Hamilton, Haymarket, Hillsboro, Lovettsville, Middleburg, and Quantico can be unreliable if the margin of error is large. A town's margin of area for an ACS data piece can be found by hovering over the town's data in a graph. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and is not considered statistically significant. In addition to the margin of error, the accuracy of the American Community Survey data for an area can be gaged by evaluating the trend. If the data has a clear trend then the data from one period to the next can be deemed reliable. Only data variables that are deemed relatively reliable have data provided at the town level. For instance, poverty data is unreliable for many towns in Northern Virginia so that data is not being provided. Median Household Income

Citizenship data compiled by the Northern Virginia Regional Commission's as part of the One Region immigration study, Coronavirus (COVID-19) immigration study, and dashboard to assess the economic impact of immigrants in Northern Virginia. Citizenship Key Facts Citizenship Immigrants in Northern Virginia have above average rates of naturalization 2013 to 2017 Period Key Facts: More than half, or 51.3 percent, of all immigrants in the region, have earned their U.S. citizenship. The Northern Virginia U.S. Citizenship rate of immigrants is higher than the national average of 48 percent. Further information about citizenship, from research NVRC has conducted separately from the One Region report, can be found on the People dashboard .

Northern Virginia town income, economically disadvantage populations, and more demographics, data and graphs. Analyzed by the Northern Virginia Regional Commission (NVRC). Median Household Income of Towns Reports, maps, and charts are best viewed on a desktop or tablet. Median Household Income of Towns Northern Virginia is known for having communities with some of the highest median incomes in the United States, including the county with the highest in the nation. High median household incomes coincide with the large, thriving business community of the Northern Virginia region. While the median household income is high, it must be recognized that there are segments of the community in need of assistance that live in this prosperous region of the country and that high housing costs offset the high income when it comes to standards of living and well-being. Median Household Income - Current The median household income of the counties, cities, and incorporated towns in Northern Virginia is shown in this graph. Loudoun County is the number one ranked county (county equivalent) for median household income in the nation. The towns of Clifton and Vienna have estimated median household incomes even greater than Loudoun County. All Northern Virginia counties, cities, and towns, have a median household income higher than Virginia, except for the Towns of Dumfries and Quantico. Quantico is the only locality in Northern Virginia with a median household income lower than the nation. Median Household Income - Historic Compared to Current Note, the American Community Survey is a survey with a small sample size. Due to the small population of many towns, the median household income of towns for should be used with caution and the margin of error of the median household income should be taken into consideration. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and the data should be used with caution. The margin of error is shown in the popup that is displayed when hovering over a bar in the bar charts. In addition to the margin of error, the accuracy of the American Community Survey data for an area can be gaged by evaluating the trend. If the data does not have a clear trend, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and the data should be used with caution.

Accessibility Statement Overview Date of last revision: 03/04/21 The Northern Virginia Regional Commission strives to ensure that its services are accessible to people with disabilities and has invested resources to help provide an easy-to-use experience for all visitors to our website, novaregiondashboard.com, regardless of the type of device used and whether a visitor uses assistive technology like a screen reader, font magnification, translation or voice recognition software. The Northern Virginia Regional Commission uses the UserWay Website Accessibility Widget powered by a dedicated accessibility server to improve its compliance with the Web Content Accessibility Guidelines (WCAG 2.1). The Northern Virginia Regional Commission accessibility menu can be enabled by clicking the accessibility menu icon that appears on the corner of the page. After triggering the accessibility menu, please wait a moment for the accessibility menu to load. The Northern Virginia Regional Commission is committed to constantly improving the accessibility of its site. Despite efforts to make all pages and content on NOVA Region Dashboard fully accessible, some content may not have yet been adapted to the strictest accessibility standards as we identify appropriate technological solutions. If you are having trouble accessing content on NOVA Region Dashboard or require assistance, please do not hesitate to contact us . Browser Accessibility Information Many popular browsers contain built-in accessibility tools. Internet Explorer Accessibility Information Firefox Accessibility Information Chrome Accessibility Information Additional Plug-ins Adobe Reader is required to view and print PDF documents that appear on this website. To download this program for free, visit the Adobe website . To read PDF documents with a screen reader, please visit the Adobe Reader Accessibility website which provides useful tools and resources.

Northern Virginia town population growth, minority-majority transition, foreign born population transformation, and more demographics, data and graphs. Analyzed by the Northern Virginia Regional Commission (NVRC). Foreign Born and Immigrants of Towns Reports, maps, and charts are best viewed on a desktop or tablet. Foreign Born and Immigrant Population of Towns Overview The Washington, D.C. metropolitan area is one of the most diverse in the country when taking into consideration the minority and foreign born (immigrant) population make-up. Northern Virginia contains a sizable amount of the metropolitan area's diverse population. The foreign born or immigrant population is transforming the region and many of it's towns. Note, the terms foreign born and immigrant are used interchangeably throughout the NOVA Region Dashboard. It is immigration that has been driving many of the major demographic trends in the region, including: School enrollment changes Sizable increases in the number of Hispanics and Asians Population and labor force growth About the Data and Proper Data Interpretation Foreign born population data is sourced from the U.S. Census Bureau 2000 Census and the American Community Survey. All of the incorporated towns in Northern Virginia have a population of less than 65,000 persons. One-year ACS estimates do not exist for incorporated places with a population of less than 65,000. All incorporated towns and places in the United States are included in the five-year ACS estimates. It is important to note that any data sourced from the ACS is based on a small sample of the population of a place. The ACS estimates for places with smaller populations such as Clifton, Dumfries, Hamilton, Haymarket, Hillsboro, Lovettsville, Middleburg, and Quantico can be unreliable if the margin of error is large. The margin of error is shown in the popup that is displayed when hovering over a bar in the bar charts. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and is not considered statistically significant. In addition to the margin of error, the accuracy of the American Community Survey data for an area can be gaged by evaluating the trend. If the data has a clear trend then the data from one period to the next can be deemed reliable. Foreign Born Population - Current Foreign Born Population Share - Current The region's highest ranked county/city is Manassas Park City, ranking 8th in the nation at 36.8%. Herndon boasts one of the largest foreign-born populations in the country, at 42.2%. Statistically, Herndon is not significantly different from Manassas Park due to the data's margins of error. Towns that are estimated to have lower foreign born population shares than the Commonwealth of Virginia are all located within rural Loudoun County (Lovettsville, Purcellville, Hamilton, Middleburg, Round Hill), except for Clifton which is located in rural Fairfax County. Note, the town of Hillsboro's 2020-2024 estimate of 29.1% foreign born is considered highly unreliable. This is evidenced by the large rise compared to previous five-year periods, as shown in the Historic Compared to Current chart in the next section. It is additionally reinforced by the wide margin of error of +/-37.6%, which stems from the town's small survey sample size. Foreign Born Population - Historic Compared to Current Foreign Born Population Share - Historic Compared to Current Immigration has been driving many of the major demographic trends in the region. The foreign born population is transforming the region. Northern Virginia's population was 21.4% foreign born in 2000 and has risen to 28.2% currently. The largest transformations since 2000 have occurred in the towns of Dumfries, Haymarket, Leesburg, Lovettsville, and Occoquan. All of these incorporated towns are located in the outer-core, which is where the majority of the region's growth has occurred. Note, the American Community Survey is a survey with a small sample size. Due to the small size of many Northern Virginia towns and small sample size of the survey, the median household income of towns should be used with caution and the margin of error of the median household income should be taken into consideration. If there is a large increase or decrease in the estimate from one time period to the next, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and the data should be used with caution. The margin of error is shown in the popup that is displayed when hovering over a bar in the bar charts. In addition to the margin of error, the accuracy of the American Community Survey data for an area can be gaged by evaluating the trend. If the data does not have a clear trend, and the margin of error is large and overlaps other periods, then the large change between time periods is likely due to statistical sampling error and the data should be used with caution.