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Demographic, economic, and other data resources and reports published by Northern Virginia Regional Commission. Data Reports and Resources Reports, maps, and charts are best viewed on a desktop or tablet. Fact Sheets Regional Fact Sheets Demographic and Economic Highlights Demographic and economic overview of the region. Last updated: Sept. 3, 2025 Monthly Report Population Change Population change trends before and after the pandemic, including components of change: Domestic migration International migration Births/deaths Last updated: Mar. 24, 2024 Annual Report Federal Jobs Overview of federal jobs in the region. How many jobs and where in the region do federal workers live and work. Last updated: Feb. 21, 2025 Special Report Reports Regional Reports and Studies Population and Households State of the Region: Shifting Migration Patterns - Affordable Housing Needs Slower population growth was occurring after the COVID-19 pandemic. This report examines the domestic migration volume and patterns underlying this, including the extent to which housing affordability, income, and age of persons are playing a role. Published January 2025. Special Report Economic Economic Tracking Report A report tracking economic indicators, including labor force, employment, unemployment, and industry sectors. *** This report has been migrated to an interactive dashboard as of 4/29/2025. The new interactive version includes not only Northern Virginia economic statistics, but also county and city level data. Click on the graphic above to navigate to the new dashboard.*** Monthly Report Foreign Direct Investment A report on foreign direct investment that uncovers the depths of economic engagement and activity that Northern Virginia has with the world. Published October 31, 2023. Key highlights of the report are listed in a report infographic. A corresponding m ap highligh ts the countries with direct economic co ntri bu tion s in Northern Virginia. Special Report State of the Region: Economic Recovery and Transformation from COVID-19 Pandemic A report on the state of the Northern Virginia region's economic recovery and the transformation from the COVID-19 pandemic. Published July 2022. Special Report Supporting Northern Virginia's Minority Owned Businesses A study on the minority-owned business community, how they were impacted by the pandemic, and recommendations for supporting them th rough the pandemic economic recovery and in the future beyond the pandemic. Published June 2021. Special Report Immigration One Region: Welcoming New Americans to Northern Virginia A study of the economic impact of immigrants to the region. Published March 2020. Special Report One Region: Addendu m A study addendum to the original report that was published in March 2020. This addendum assessed the economic impact of immigrants relevant to the COVID-19 pandemic crisis response. Published October 2020. Special Report

Northern Virginia Regional Commission's One Region immigration study, Coronavirus (COVID-19) immigration study, and dashboard assessing the economic impact of immigrants in Northern Virginia. The report and a dashboard of key demographic and economic findings from the report are found here. Immigration Study Reports, maps, and charts are best viewed on a desktop or tablet. The Northern Virginia Regional Commission was pleased to collaborate with the Partnership for a New American Economy (NAE) and the Community Foundation for Northern Virginia on the study, One Region: Welcoming New Americans to Northern Virginia. The original study was published on March 12, 2020. It is a study of the economic impact of immigrants to the region. An addendum to the study was published on October 21, 2020 that provides immigrant data relevant to the COVID-19 pandemic crisis response . The research was conducted by NAE. NAE has undertaken similar studies throughout the United States. This One Region report dashboard summarizes and reports on immigration in the Northern Virginia region. This dashboard provides quick access to key data pieces found in the report. This One Region immigration dashboard provides data not only of the overall Northern Virginia region, but also on the localities within the region . A webinar was hosted on October 21, 2020. For copies of the presentations and video recording go to the webinar webpage. Download a copy of the original report, published March 2020 Overview of the One Region Report The One Region report is a comprehensive picture of new Americans in Northern Virginia (NOVA). It highlights the size and rapid growth in the immigrant population in the region and their impact on the local economy, including injecting more money into local businesses, property markets, and municipal budgets as consumers, homebuyers, and taxpayers. Immigrants are major contributors to Northern Virginia's (NOVA) economy as highlighted in the report. The NOVA immigrant population is diverse. These people emigrate, seeking a better life for themselves and their families. “Immigrants are a vital part of the economic and social fabric of Northern Virginia. Their success is our success, and we must continue to be a welcoming community for all to ensure our long-term prosperity,” said P. David Tarter, Chairman of the Northern Virginia Regional Commission and Mayor of the City of Falls Church. Immigrants are an indispensable part of the local Northern Virginia economy at all levels, as workers, business owners, taxpayers and consumers. Trivia: What is the foreign born share of the population in NOVA? What is the foreign born share of the population in NOVA? Source: U.S Census Bureau, 2018 American Community Survey, 5-Year Estimates. 27.6% Immigrants widen and deepen the labor market with a vast array of skills and levels of expertise. They help businesses, farms, and factories fill workforce gaps at all levels of the labor market, allowing companies to meet market demands and expand their operations, which leads to more job creation. * Except where otherwise noted, the term “immigrant” and “foreign-born” are used interchangeably throughout the NOVA Region Dashboard and in the "One Region" report. COVID-19 Addendum One Region Report Addendum on COVID-19 Response This brief provides a glimpse at 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. The immigrant population is essential to our country’s rapid COVID-19 response efforts. Download a copy of the COVID-19 addendum report published October 2020 Data Charts and Key Findings by Report Topic (best viewed on desktop) The data is sourced from the U.S. Census Bureau American Community Survey (ACS) five-year estimates, as well as other sources. The ACS is a survey based on a sample of the population. Sample surveys include a degree of uncertainty and error in the data. The larger the population and housing units of an area or data variable, the more reliable the ACS data. The Northern Virginia regional data is more reliable than the county level data that is presented in the data charts. Users should interpret the data by keeping this in mind. Citizenship Entrepreneurship Internet Access Economy Healthcare Language Spoken Education Housing Labor Force Additional Immigrant Information (best viewed on desktop) Further information about Northern Virginia's immigrant population, from research NVRC has conducted separately from the One Region report, can be found on the People dashboard. People There is a myriad of non-governmental organizations (NGOs) that provide services to immigrants. A number of the local governments in Northern Virginia also provide links to information and services. Where to Get Help

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). Education of Towns Education Data of Towns 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 education data of incorporated towns is sourced from the U.S. Census Bureau 2000 Census and the American Community Survey (ACS). 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. 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. Educational Attainment

Immigrant labor force data compiled by the Northern Virginia Regional Commission's as part of the One Region immigration study, Coronavirus (COVID-19) immigration study, and data dashboard to assess the economic impact of immigrants in Northern Virginia. Labor Force: COVID-19 Pandemic Reports, maps, and charts are best viewed on a desktop or tablet. Key Facts Labor Force - COVID-19 Immigrants are heavily represented among the region's frontline essential and healthcare workforce fighting against the virus and keeping the region running. Workers in essential industries are typically unable to work remotely, increasing their risk of exposure to the disease. Workers in non-essential industries have been severely affected by the economic fallout of the coronavirus outbreak, especially those who cannot work remotely or whose places of work depend normally on face-to-face interaction. 2014 to 2018 Period Key Facts: More than an estimated 410,000 workers in Northern Virginia work in essential industries and occupations. 47.9 percent of all essential workers in Northern Virginia are foreign born. The total population of Northern Virginia is 27.6% foreign born. This indicates that immigrants are disproportionately affected. More than 40 percent of all essential healthcare workers in Northern Virginia are foreign born. Within essential healthcare occupations, foreign born makes up more than half of all nursing assistants, personal care aides, lab technologists and technicians, and licensed practical or vocational nurses. 38.7 percent of all non-essential industry workers in Northern Virginia are foreign born. STEM work is vital to Northern Virginia's economy. Foreign born workers comprise more than half of financial services and more than one quarter of transportation, retail trade, educational services, and healthcare and social services. Explore labor force topics by clicking on the tabs below

Immigration services and help for the Northern Virginia region. Listing of immigration services maintained by Northern Virginia Regional Commission found on NOVA Region Dashboard. Where to Get Help? Help to Immigrants There are a myriad of non-governmental organizations (NGOs) that provide services to immigrants, including refugees. A number of the local governments in Northern Virginia also provide links to information and services. Alexandria City American Civil Liberties Union - Virginia Affiliate American Red Cross Arlington County Government Ayuda CAIR Coalition CASA de Virginia Catholic Charities of the Diocese of Arlington - Hogar Immigrant Services Ethiopian Community Development Council, Inc. Fairfax County Government Just Neighbors Ministry Kids in Need of Defense (KIND) Korean Community Service Center of Greater Washington Legal AID Justice Center Literacy Council of Northern Virginia Loudoun Literacy Council Lutheran Social Services - Refugee and Immigration Services (Falls Church Office) Northern Virginia Family Services SCAN of Northern Virginia Tahirih Justice Center The National Korean American Service & Education Consortium Uceda English Institute of Virginia US Committee for Refugees and Immigrants VOICE

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, 2024 the Northern Virginia population was estimated to be 2,601,818. 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 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 60.4%, which is nearly double the United States, and holding a graduate or professional degree is 29.4%, 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 more 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 more 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 (7th), Loudoun County (8th), and Fairfax City (13th). Overall, Northern Virginia's share is 61.4% for residents age 25 or more with bachelor's or higher degrees, which is much 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 more 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 843 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 more with bachelor's or higher degrees are located in Northern Virginia. Those include Arlington County (1st), the City of Alexandria (2nd), Loudoun (5th), and Fairfax (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 more 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 more 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 (5th), Fairfax County (11th), City of Fairfax (17th), and Loudoun County (19th). Overall, Northern Virginia's share is 29.8% for residents age 25 or more with graduate or professional degrees, which is much higher than 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 more 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 843 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 more with graduate or professional degrees are located in Northern Virginia. Those include Arlington (1st), the City of Alexandria (5th), Fairfax (8th), 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 over, becoming even more highly educated than it already was. Northern Virginia's age 25 and over population holding bachelor's or higher degrees in 2000 was 50.7% and in the 2019-2023 period was 61.4%, compared to the United States which was 24.4% and 35.0% 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 over holding a bachelor's or higher degree, for the regions large jurisdictions (population of 65,000 or more), are shown in the following graph. Key Facts: Northern Virginia, as defined for this analysis using the region's five largest jurisdictions, trended upward, increasing from an estimated 54.7% in 2010 to 62.2% in 2023. Note, from 2022 to 2023 Northern Virginia appears to have declined, but this may be a statistical anomaly due to the small sample size of the American Community Survey and the fact that the 2023 figure is not statistically significant difference from 2022 based on the margin of error. Also, it may be a statistical anomaly since it was declines were not a pattern seen across all jurisdictions, unlike graduate degrees where it was a pattern across all jurisdictions. When the 2024 data is released, it can be confirm whether there is in fact a downward trend. All of the region's five largest jurisdictions have trended upward since 2010 in their percentage with a bachelor's degree or higher. Graduate or Professional Degree - Historic Compared to Current Five-Year Estimates Northern Virginia's age 25 and over population holding professional and graduate degrees in 2000 was 22.1% and in the 2019-2023 period it was 29.8%, compared to the United States which was 8.9% and 13.7% 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 over holding a graduate or professional degree, for the regions large jurisdictions (population of 65,000 or more), are shown in the following graph. Key Facts: Northern Virginia, as defined for this analysis using the region's five largest jurisdictions, trended upward in the share of the population holding graduate or professional degrees, increasing from an estimated 25.4% in 2010 to a peak of 30.8% in 2022, and then there was a decline to 30.1% in 2023. The decline from 2022 to 2023 was a statistically significant difference when accounting for the survey's margin of error. This may be due to the wave of retirement occurring in the region and because the remote and hybrid work trend has provided an opportunity for higher income, highly educated office workers to migrate out of the region to places that have a more affordable cost of living. Learn more about these causes in the NVRC report, Shifting Migration Pattern of Northern Virginia: Affordable Housing Needs published in January 2025. All of the region's five largest jurisdictions trended upward from 2010 to 2022 in the percentage with a graduate or professional degree. However, from 2022 to 2023 all jurisdictions did decline in the share of the population with graduate or professional degrees.

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 Information on economics of the overall Northern Virginia region and its county and cities. Overall Information on economics of Northern Virginia incorporated towns . Towns

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). Race and Ethnicity Overall Reports, maps, and charts are best viewed on a desktop or tablet. Race and Ethnicity of Northern Virginia Overview A big story of the region is its racial and ethnic diversity and continuing diversification. Northern Virginia's racial and ethnic composition makes it more diverse today than the United State and Virginia and this has been the case for decades. Much of the continued diversification is attributed to the sizable increases in the number of Hispanics, Asians, and multiracial persons in the region. The following charts show the region's population by race and ethnicity, along with analyses of diversity for Northern Virginia and its counties and cities. Upcoming Changes to Categorization of Race/Ethnicity Race/ethnicity data collected by the U.S. Census Bureau is the primary source of race and ethnicity demographics. The U.S. Census Bureau currently collects race and ethnicity data based on the U.S. Office of Management and Budget (OMB) standards from 1997. New race/ethnicity standards were adopted by the Office of Management and Budget on March 28, 2024, the first such adoption since 1997. Changes are coming to how race and ethnicity information will be collected and reported in the United States. Federal agencies, including the U.S. Census Bureau, must implement the new standards into data collections as soon as possible, but no later than March 28, 2029. The U.S. Census Bureau American Community Survey (ACS), a survey conducted annually, will be one of the first U.S. Census Bureau products to implement the new standards. As of July 2024, the U.S. Census Bureau was proposing to begin implementation of data collection in 2026 or 2027 for the ACS products. The 2030 Decennial Census will also reflect the new standards. The new race categories will offer individuals more precise ways to self-identify, especially for people who self-identify as multiracial or multiethnic. This will result in a more accurate representation of the U.S. population's race and ethnic characteristics. Changes will include a single combined question instead of separate race and ethnicity questions. Also, a new "Middle Eastern or North African" category will be added. These changes aim to better reflect the diversity of the American population. These changes will create challenges and implications for our understanding of the population and trends because the data will not be comparable to prior data. These modifications will alter the population size of subgroups. Specifically, the Census Bureau’s 2015 National Content Test results suggest anticipating increases in those identifying as Middle Eastern or North African, Hispanic or Latino, and Black or African American. Conversely, the number of individuals categorized as “white” or "some other race" is projected to decline. The combined race and ethnicity question is also expected to improve response rates for the race component on the decennial census and ACS forms. More information can be found on the U.S. Census Bureau's website . Decennial Census Data The Decennial Census is based on a survey of the entire population. It is conducted once a decade. The 2020 Decennial Census population was released on August 12, 2021. The Decennial Census regional, county, and city population data is shown in the interactive charts that follow. The 2020 Census had improvements to the design of the two separate questions for race and ethnicity, data processing, and coding, which enabled a more thorough and accurate depiction of how people prefer to self-identify. These changes along with actual demographic changes in the population result in the changes seen from 2010 to 2020 in the following data. For more details on the 2020 Census questionnaire changes and its impacts please view the U.S. Census Bureau's technical information . The following charts show the region's population by race and ethnicity, along with analyses of diversity for Northern Virginia and its incorporated towns. People of Hispanic/Latino origin are an ethnic group and may be of any race. To display Hispanic/Latino together with racial groups, it is common to cross-tabulate race and ethnicity to display Hispanic/Latino as a single category and the non-Hispanic race groups as categories that sum to the total population. This means of displaying race and ethnic data has become quite common and for available data, it is the closest categorization c ompared to the new race/ethnicity standards that were adopted by the Office of Management and Budget on March 28, 2024 (for more information see prior section ). With this classification, Hispanic/Latino is treated identically to major race groups and not independently of race. Also, Census Bureau research has shown that this classification is much less impacted by the 2020 Census questionnaire improvements. NVRC has migrated its demographic analysis to the cross-tabulated categories. The following charts, as well as the calculation of diversity, use the cross-tabulated categories.

Housing characteristics compiled by the Northern Virginia Regional Commission's as part of the One Region immigration study, coronavirus (COVID-19) immigration study, and data dashboard to assess the economic impact of immigrants in Northern Virginia. Housing Characteristics Reports, maps, and charts are best viewed on a desktop or tablet. Key Facts Housing Foreign born headed households, especially those on the lower end of the income spectrum have significantly larger household sizes than U.S. born headed households. COVID-19 More occupants per household present opportunities for transmission of COVID-19 among members within that household since COVID-19 is spread through close contact. Housing instability from the pandemic requires a very proactive role from local communities. 2014 to 2018 Five-Year Estimates Key Facts: Foreign born headed households, in general, are larger than U.S. Born headed households in Northern Virginia and its localities. Northern Virginia has a foreign born average household size of 3.22, while U.S. born headed is 2.39. The gap between the foreign born and U.S. born average household size in Northern Virginia shrinks with each higher income quintile, almost reaching parity at the top among the highest income households. The lowest income quintile has a gap of 0.9 persons per household, while the highest income quintile has a gap of 0.2 persons per household. The housing tenure of the foreign born in Northern Virginia is 58 percent owner and 42 percent renter. This distribution varies widely by locality. The innermost, urban localities of Arlington and Alexandria have a higher rate of renters than the outer, suburban localities. The housing type of the foreign born in Northern Virginia is 60.5 percent single-family, 37.5 percent multi-family, and 2.0 percent other. This distribution varies widely by locality. The innermost, urban localities of Alexandria and Arlington have a majority residing in multi-family and the outer, suburban localities have a majority residing in single-family. Explore housing topics by clicking on the tabs below

Immigrant education data compiled by the Northern Virginia Regional Commission's as part of the One Region immigration study, Coronavirus (COVID-19) immigration study, and data dashboard to assess the economic impact of immigrants in Northern Virginia. Education Reports, maps, and charts are best viewed on a desktop or tablet. Key Facts Education Immigrants who settle in Northern Virginia are well educated and bring with them varying levels of work and educational experience 2013 to 2017 Period Key Facts: 20.9 percent of immigrants had an advanced degree, either a master’s, professional or doctoral degree. 44.5 percent of immigrants in Northern Virginia age 25 and older had at least a bachelor’s degree. The proportion of immigrants with a bachelor’s degree or higher in Northern Virginia at 44.5 percent, is much higher than immigrants in the United States at 31.2 percent.

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