| Locality | Postal Code |
|---|---|
| Denison, Jefferson | 66419 |
| Grantville, Jefferson | 66429 |
| McLouth, Jefferson | 66054 |
| Meriden, Jefferson | 66512 |
| Nortonville, Jefferson | 66060 |
| Oskaloosa, Jefferson | 66066 |
| Ozawkie, Jefferson | 66070 |
| Perry, Jefferson | 66073 |
| Valley Falls, Jefferson | 66088 |
| Winchester, Jefferson | 66097 |