![](https://www.vaco.org/wp-content/uploads/Fairfax-county-seal.jpg)
![](https://www.vaco.org/wp-content/uploads/Fairfax-county-seal.jpg)
County Courthouse
![](https://www.vaco.org/wp-content/uploads/2022/09/3951872177.png)
County Details
County Seat: Fairfax
Year Organized: 1742
Total Square Miles: 391
2020 Population: 1,150,309
Persons/Square Mile: 2942
County Structure
Government Type: County
Authority: Dillon’s Rule
Legislative Body: Board of Supervisors
Size of Legislative Body: 10