8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 66067 | Ottawa | 16,330 |
| 66092 | Wellsville | 4,351 |
| 66076 | Pomona | 2,416 |
| 66080 | Richmond | 980 |
| 66042 | Lane | 929 |
| 66078 | Princeton | 805 |
| 66079 | Rantoul | 752 |
| 66095 | Williamsburg | 583 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Franklin County, Kansas (US Census).