| Place Name | Fairfield |
| Place Type | City |
| ZIP Code(s) | 45014 |
| County | Butler County |
| Area Code(s) | 283,513 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 42,638 |
| Population Growth Rate (2010-19) | 5.64% |
| Majority Ethnicity | White 71.21% |
| Metro/Micro Stats Area | Cincinnati, OH-KY-IN |
| US Congressional District(s) | Ohio 8th |
| State House Districts | 51 |
| State Senate Districts | 4 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 71.21% |
| African American | 15.94% |
| Hispanic | 0.03% |
| Asian | 5.64% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 7.19% |