| Zip Code | City | Population ↓ |
|---|---|---|
| 50677 | Waverly | 12,746 |
| 50674 | Sumner | 3,539 |
| 50622 | Denver | 3,179 |
| 50676 | Tripoli | 2,095 |
| 50647 | Janesville | 2,032 |
| 50668 | Readlyn | 1,159 |
| 50666 | Plainfield | 720 |
| 50631 | Frederika | 250 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Bremer County, Iowa (US Census).