Modest population growth predicted for Fairfax County

Fairfax County has experienced marginal population growth between 2024 and 2025, while the median home market value rose by more than 6%.

Those are some of the major findings in the county’s just-released demographic report for 2025 by the Department of Management and Budget.

Here are some key statistics from the 225-page report:

• The county’s total population was 1,199,700 in 2025, an increase of just 0.3% from the previous year.

• The population is expected to grow by 0.5% to 0.6% annually through 2055.

• The county had 438,700 total housing units last year and 428,400 total households.

• The median age of residents has been steadily increasing, from 25.2 years in 1970 to 38.3 years in 2020.

• Seniors make up the largest age category. The percent of the population age 65 and over was 15.9 in 2025 and is expected to rise to 23.9 in 2045.

• The racial and ethnic mix has also changed in the past 20 years. Between 2000 and 2020, the percentage of Whites has declined from 69.9% to 49.5%. The Black population has gone from 8.6% to 9.6%. The biggest increases were among Asian and Pacific Islanders (13.1% to 20.5%) and Hispanics (11.0% to 17.3%). The percent of people listed as “other” increased from 8.2 to 19.8.

• In 2024, 36.4% of households and 44.8% of families had an income of $200,000 or more. The median household income was $154,545 in 2024, up from $141,553 in 2023. Among other jurisdictions in the DMV, only Loudoun County had a higher median household income.

• The average monthly rent for multifamily housing has climbed from $1,958 in 2020 to $2,092 in 2024.

• The estimated median market value of owned housing units has gone up from $648,270 in 2022 to $708,383 in 2025.

• In Mason District, the median market value of owned housing units was $694,496 in 2025, up 6.4% from 2024.

• Fairfax County’s poverty rate dropped from 6.6% in 2014 to 5.9% in 2024.

• Among the county’s nine magisterial districts, Mason District has the second-highest population density, at 8.3 people per acre. Providence has a density of 9.1 per acre.

• Among planning districts, the Bailey’s Planning District is the densest, with 11.1 people per acre.

• The population of Mason District was 124,439 in 2025 and is projected to climb to 128,314 in 2035 and 141,070 in 2055.

• Mason District has by far the oldest housing stock among the county’s nine districts; 56.4% of the units in Mason were built before 1970, compared to 25.4% countywide.