
Fairfield
- County:
- Jefferson County
- County Seat:
- Yes
- Area (mi²):
- 6.614
- State:
- Iowa
Fairfield is a city located in Jefferson County, Iowa. Fairfield has a 2025 population of 9,200. It is also the county seat of .Fairfield is currently declining at a rate of -0.54% annually and its population has decreased by -2.64% since the most recent census, which recorded a population of 9,449 in 2020.
The average household income in Fairfield is $75,378 with a poverty rate of 19.18%. The median age in Fairfield is 40.5 years: 37.1 years for males, and 46.4 years for females.