8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 66067 | Ottawa | 16,146 |
| 66092 | Wellsville | 4,211 |
| 66076 | Pomona | 2,231 |
| 66042 | Lane | 1,052 |
| 66095 | Williamsburg | 1,024 |
| 66080 | Richmond | 928 |
| 66078 | Princeton | 766 |
| 66079 | Rantoul | 678 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Franklin County, Kansas (US Census).