| Locality | Post Code |
|---|---|
| Amanda, Fairfield | 43102 |
| Baltimore, Fairfield | 43105 |
| Bremen, Fairfield | 43107 |
| Canal Winchester, Fairfield | 43110 |
| Carroll, Fairfield | 43112 |
| Etna, Fairfield | 43046, 43147 |
| Hideaway Hills, Fairfield | 43107 |
| Lancaster, Fairfield | 43130 |
| Lithopolis, Fairfield | 43136 |
| Millersport, Fairfield | 43046 |
| Pickerington, Fairfield | 43147 |
| Pleasantville, Fairfield | 43148 |
| Rushville, Fairfield | 43150 |
| Stoutsville, Fairfield | 43154 |
| Sugar Grove, Fairfield | 43155 |
| Thurston, Fairfield | 43157 |
| West Rushville, Fairfield | 43150 |