ZIP Code 45018 is located in Fairfield Ohio. 45018 is entirely within Butler County. Regionally, 45018 is located in Metro Cincinnati.
| ZIP Code Name | Fairfield |
| Primary County | Butler County |
| ZIP Code Type | PO Box |
| Current Time | EST |
| Coordinates | 39.33539963,-84.55653381 |
| Adjacent ZIP Codes | |
| Region | Metro Cincinnati |
| Metropolitan/Micropolitan Stat Area | Cincinnati, OH-KY-IN |
| Time Zone | Eastern Standard Time |
| IANA Timezone | America/New_York |
| School Districts in 45018 | |
| Elementary Schools in 45018 | |
| Middle Schools in 45018 | |
| High Schools in 45018 |