
Fairfield township
- County:
- Butler County
- County Seat:
- No
- Area (mi²):
- 39.693
- State:
- Ohio
Fairfield township is located in Butler County, Ohio. Fairfield township has a 2025 population of 3,671. Fairfield township is currently growing at a rate of 0.36% annually and its population has increased by 0.99% since the most recent census, which recorded a population of 3,635 in 2020.
The average household income in Fairfield township is $80,255 with a poverty rate of 6.61%. The median age in Fairfield township is 35.5 years: 35.8 years for males, and 35 years for females.