How many people live in Fairfax County, VA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 1.16 million people living in Fairfax County, VA. That makes Fairfax County the 42nd-most populous county in the US. It is also the largest in Virginia, accounting for 13.1% of the state’s population.
1.16M
population of Fairfax County, VA (2024)
13.1%
County share of the Virginia population (2024)
About 1.16 million people lived in Fairfax County, VA in 2024.
Population estimates, 2000–2024
What are Fairfax County, VA’s age demographics?
About 184,500 Fairfax County residents are aged 65 and older in 2024. That represents 15.9% of its population. For comparison, the age group represents 17.8% of Virginia’s population and 18% in the US overall.
Another 258,000 Fairfax County residents, or 22.2% of the population, were children under 18. For comparison, the age group represents 21.6% of Virginia’s population and 21.6% in the US overall.
A lower share of Fairfax County, VA's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Fairfax County, VA’s racial and ethnic demographics?
Non-Hispanic Asian residents make up 20.9% of the Fairfax County, VA population, higher than the national share of 6.5%. Fairfax County, VA also has a larger share of people identifying as non-Hispanic two or more races (3.7%) than the US overall (2.5%).
In contrast, Fairfax County’s non-Hispanic white population accounts for 47%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 10.3% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Fairfax County, VA has a higher share of a non-Hispanic Asian population than Virginia as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Fairfax County, VA is Herndon with about 25,200 residents in 2024.
Cities and towns in Fairfax County, VA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Herndon (pt.) | 25,180 |
| 2. | Vienna | 16,562 |
| 3. | Clifton | 242 |
| 4. | Balance of Fairfax County | 1,118,941 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
