8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 66502 | Manhattan | 43,247 |
| 66503 | Manhattan | 17,272 |
| 66442 | Fort Riley | 16,876 |
| 66506 | Manhattan | 3,189 |
| 66517 | Ogden | 1,628 |
| 66531 | Riley | 1,348 |
| 66449 | Leonardville | 981 |
| 66554 | Randolph | 744 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Riley County, Kansas (US Census).