8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 66502 | Manhattan | 44,813 |
| 66442 | Fort Riley | 16,709 |
| 66503 | Manhattan | 16,393 |
| 66506 | Manhattan | 3,179 |
| 66517 | Ogden | 1,529 |
| 66531 | Riley | 1,425 |
| 66449 | Leonardville | 1,083 |
| 66554 | Randolph | 650 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Riley County, Kansas (US Census).