14 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 52591 | Sigourney | 2,721 |
| 52563 | Hedrick | 1,602 |
| 50268 | What Cheer | 908 |
| 52585 | Richland | 838 |
| 52335 | South English | 644 |
| 52550 | Delta | 552 |
| 52231 | Harper | 539 |
| 50136 | Keswick | 376 |
| 52576 | Ollie | 371 |
| 52355 | Webster | 283 |
| 50104 | Gibson | 103 |
| 52568 | Martinsburg | 80 |
| 52562 | Hayesville | 52 |
| 50255 | Thornburg | 51 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 14 ZCTAs in Keokuk County, Iowa (US Census).