Fairfield township
- County:
- Butler County
- County Seat:
- No
- Area (mi²):
- 31.92
- State:
- Ohio
Fairfield township is located in Butler County, Ohio. Fairfield township has a 2026 population of 1,462. Fairfield township is currently growing at a rate of 0.76% annually and its population has increased by 1.53% since the most recent census, which recorded a population of 1,440 in 2020.
The median household income in Fairfield township is $106,050 with a poverty rate of 2.63%. The median age in Fairfield township is 44.2 years: 46.5 years for males, and 41.6 years for females. For every 100 females there are 95.4 males.