8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 66502 | Manhattan | 43,693 |
| 66503 | Manhattan | 17,273 |
| 66442 | Fort Riley | 16,890 |
| 66506 | Manhattan | 3,155 |
| 66517 | Ogden | 1,696 |
| 66531 | Riley | 1,256 |
| 66449 | Leonardville | 937 |
| 66554 | Randolph | 770 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Riley County, Kansas (US Census).