
Fairfield
- County:
- Solano County
- County Seat:
- Yes
- Area (mi²):
- 41.586
- State:
- California
Fairfield is a city located in Solano County, California. Fairfield has a 2025 population of 121,391. It is also the county seat of Solano County. Fairfield is currently growing at a rate of 0.26% annually and its population has increased by 1.3% since the most recent census, which recorded a population of 119,833 in 2020.
The average household income in Fairfield is $127,639 with a poverty rate of 10.47%. The median age in Fairfield is 36.8 years: 36.1 years for males, and 37.9 years for females.