About this dataset

Context

The dataset tabulates the Fairfax County population over the last 20 plus years. It lists the population for each year, along with the year on year change in population, as well as the change in percentage terms for each year. The dataset can be utilized to understand the population change of Fairfax County across the last two decades. For example, using this dataset, we can identify if the population is declining or increasing. If there is a change, when the population peaked, or if it is still growing and has not reached its peak. We can also compare the trend with the overall trend of United States population over the same period of time.

Key observations

In 2023, the population of Fairfax County was 1.14 million, a 0.23% increase year-by-year from 2022. Previously, in 2022, Fairfax County population was 1.14 million, a decline of 0.25% compared to a population of 1.14 million in 2021. Over the last 20 plus years, between 2000 and 2023, population of Fairfax County increased by 166,795. In this period, the peak population was 1.15 million in the year 2019. The numbers suggest that the population has already reached its peak and is showing a trend of decline. Source: U.S. Census Bureau Population Estimates Program (PEP).

Content

When available, the data consists of estimates from the U.S. Census Bureau Population Estimates Program (PEP).

Data Coverage:

• From 2000 to 2023

Variables / Data Columns

• Year: This column displays the data year (Measured annually and for years 2000 to 2023)
• Population: The population for the specific year for the Fairfax County is shown in this column.
• Year on Year Change: This column displays the change in Fairfax County population for each year compared to the previous year.
• Change in Percent: This column displays the year on year change as a percentage. Please note that the sum of all percentages may not equal one due to rounding of values.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Fairfax County Population by Year. You can refer the same here

Graph and download economic data for Resident Population in Fairfax County, VA (VAFAIR5POP) from 1970 to 2024 about Fairfax County, VA; Washington; VA; residents; population; and USA.

About this dataset

Context

The dataset tabulates the Fairfax city population by age. The dataset can be utilized to understand the age distribution and demographics of Fairfax city.

Content

The dataset constitues the following three datasets

• Fairfax city, VA Age Group Population Dataset: A complete breakdown of Fairfax city age demographics from 0 to 85 years, distributed across 18 age groups
• Fairfax city, VA Age Cohorts Dataset: Children, Working Adults, and Seniors in Fairfax city - Population and Percentage Analysis
• Fairfax city, VA Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Graph and download economic data for Percent of Population Below the Poverty Level (5-year estimate) in Fairfax County, VA (S1701ACS051059) from 2012 to 2023 about Fairfax County, VA; Washington; VA; percent; poverty; 5-year; population; and USA.

Graph and download economic data for Estimate, Median Age by Sex, Total Population (5-year estimate) in Fairfax County, VA (B01002001E051059) from 2009 to 2023 about Fairfax County, VA; age; Washington; VA; median; 5-year; and USA.

About this dataset

Context

The dataset tabulates the data for the Fairfax city, VA population pyramid, which represents the Fairfax city population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates. It lists the male and female population for each age group, along with the total population for those age groups. Higher numbers at the bottom of the table suggest population growth, whereas higher numbers at the top indicate declining birth rates. Furthermore, the dataset can be utilized to understand the youth dependency ratio, old-age dependency ratio, total dependency ratio, and potential support ratio.

Key observations

• Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Fairfax city, VA, is 31.1.
• Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Fairfax city, VA, is 21.8.
• Total dependency ratio for Fairfax city, VA is 52.9.
• Potential support ratio, which is the number of youth (working age population) per elderly, for Fairfax city, VA is 4.6.

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

Age groups:

• Under 5 years
• 5 to 9 years
• 10 to 14 years
• 15 to 19 years
• 20 to 24 years
• 25 to 29 years
• 30 to 34 years
• 35 to 39 years
• 40 to 44 years
• 45 to 49 years
• 50 to 54 years
• 55 to 59 years
• 60 to 64 years
• 65 to 69 years
• 70 to 74 years
• 75 to 79 years
• 80 to 84 years
• 85 years and over

Variables / Data Columns

• Age Group: This column displays the age group for the Fairfax city population analysis. Total expected values are 18 and are define above in the age groups section.
• Population (Male): The male population in the Fairfax city for the selected age group is shown in the following column.
• Population (Female): The female population in the Fairfax city for the selected age group is shown in the following column.
• Total Population: The total population of the Fairfax city for the selected age group is shown in the following column.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Fairfax city Population by Age. You can refer the same here

Graph and download economic data for Population Estimate, Total (5-year estimate) in Fairfax County, VA (B03002001E051059) from 2009 to 2023 about Fairfax County, VA; Washington; VA; estimate; persons; 5-year; population; and USA.

30-year population forecasts at a parcel level within Fairfax County developed on the VALID_TO date in the attribute table. For methodology and a data dictionary please view the IPLS data dictionary

Current population at a parcel level within Fairfax County as of the VALID_TO date in the attribute table.

For methodology and a data dictionary please view the IPLS data dictionary

Graph and download economic data for Population Estimate, Total, Hispanic or Latino, Some Other Race Alone (5-year estimate) in Fairfax County, VA (B03002018E051059) from 2009 to 2023 about Fairfax County, VA; Washington; VA; latino; hispanic; estimate; persons; 5-year; population; and USA.

Population Estimate, Total, Hispanic or Latino (5-year estimate) in Fairfax County, VA was 199153.00000 Persons in January of 2023, according to the United States Federal Reserve. Historically, Population Estimate, Total, Hispanic or Latino (5-year estimate) in Fairfax County, VA reached a record high of 199153.00000 in January of 2023 and a record low of 141343.00000 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Population Estimate, Total, Hispanic or Latino (5-year estimate) in Fairfax County, VA - last updated from the United States Federal Reserve on July of 2025.

Estimate, Median Age by Sex, Total Population (5-year estimate) in Fairfax County, VA was 38.90000 Years of Age in January of 2023, according to the United States Federal Reserve. Historically, Estimate, Median Age by Sex, Total Population (5-year estimate) in Fairfax County, VA reached a record high of 38.90000 in January of 2023 and a record low of 37.10000 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Estimate, Median Age by Sex, Total Population (5-year estimate) in Fairfax County, VA - last updated from the United States Federal Reserve on July of 2025.

Graph and download economic data for Population Estimate, Total, Not Hispanic or Latino, Native Hawaiian and Other Pacific Islander Alone (5-year estimate) in Fairfax County, VA (B03002007E051059) from 2009 to 2023 about Fairfax County, VA; Washington; Pacific Islands; VA; non-hispanic; estimate; persons; 5-year; population; and USA.

U.S. Census Bureau QuickFacts statistics for Fairfax County, Virginia. QuickFacts data are derived from: Population Estimates, American Community Survey, Census of Population and Housing, Current Population Survey, Small Area Health Insurance Estimates, Small Area Income and Poverty Estimates, State and County Housing Unit Estimates, County Business Patterns, Nonemployer Statistics, Economic Census, Survey of Business Owners, Building Permits.

About this dataset

Context

The dataset tabulates the Fairfax County population distribution across 18 age groups. It lists the population in each age group along with the percentage population relative of the total population for Fairfax County. The dataset can be utilized to understand the population distribution of Fairfax County by age. For example, using this dataset, we can identify the largest age group in Fairfax County.

Key observations

The largest age group in Fairfax County, VA was for the group of age 40 to 44 years years with a population of 83,411 (7.29%), according to the ACS 2019-2023 5-Year Estimates. At the same time, the smallest age group in Fairfax County, VA was the 85 years and over years with a population of 16,983 (1.48%). Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates

Age groups:

• Under 5 years
• 5 to 9 years
• 10 to 14 years
• 15 to 19 years
• 20 to 24 years
• 25 to 29 years
• 30 to 34 years
• 35 to 39 years
• 40 to 44 years
• 45 to 49 years
• 50 to 54 years
• 55 to 59 years
• 60 to 64 years
• 65 to 69 years
• 70 to 74 years
• 75 to 79 years
• 80 to 84 years
• 85 years and over

Variables / Data Columns

• Age Group: This column displays the age group in consideration
• Population: The population for the specific age group in the Fairfax County is shown in this column.
• % of Total Population: This column displays the population of each age group as a proportion of Fairfax County total population. Please note that the sum of all percentages may not equal one due to rounding of values.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Fairfax County Population by Age. You can refer the same here

Equifax Subprime Credit Population for Fairfax County, VA was 12.53% in January of 2025, according to the United States Federal Reserve. Historically, Equifax Subprime Credit Population for Fairfax County, VA reached a record high of 26.42 in April of 1999 and a record low of 11.50 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Equifax Subprime Credit Population for Fairfax County, VA - last updated from the United States Federal Reserve on June of 2025.

Graph and download economic data for Employed Persons in Fairfax County, VA (LAUCN510590000000005A) from 1990 to 2024 about Fairfax County, VA; Washington; VA; household survey; employment; persons; and USA.

Resident Population in Fairfax County, VA was 1160.92500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Fairfax County, VA reached a record high of 1160.92500 in January of 2024 and a record low of 454.27500 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Fairfax County, VA - last updated from the United States Federal Reserve on July of 2025.

Current households at a parcel level within Fairfax County as of the VALID_TO date in the attribute table.

For methodology and a data dictionary please view the IPLS data dictionary

Fairfax City, VA - Population Estimate, Total, Not Hispanic or Latino, American Indian and Alaska Native Alone (5-year estimate) in Fairfax city, VA was 21.00000 Persons in January of 2023, according to the United States Federal Reserve. Historically, Fairfax City, VA - Population Estimate, Total, Not Hispanic or Latino, American Indian and Alaska Native Alone (5-year estimate) in Fairfax city, VA reached a record high of 108.00000 in January of 2010 and a record low of 0.00000 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Fairfax City, VA - Population Estimate, Total, Not Hispanic or Latino, American Indian and Alaska Native Alone (5-year estimate) in Fairfax city, VA - last updated from the United States Federal Reserve on June of 2025.