Fairfax is a city located in Fairfax County and Fairfax City County Virginia. It is also the county seat of Fairfax County. With a 2020 population of 24,607, it is the 24th largest city in Virginia and the 1568th largest city in the United States . Fairfax is currently growing at a rate of 1.21% annually and its population has increased by 9.05% since the most recent census, which recorded a population of 22,565 in 2010. Fairfax reached it's highest population of 24,607 in 2021. Spanning over 6 miles, Fairfax has a population density of 3,943 people per square mile.
The average household income in Fairfax is $138,291 with a poverty rate of 9.27%. The median rental costs in recent years comes to $1,834 per month, and the median house value is $560,400. The median age in Fairfax is 38.2 years, 36.5 years for males, and 39.8 years for females.