11 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 50665 | Parkersburg | 2,693 |
| 50670 | Shell Rock | 2,270 |
| 50636 | Greene | 2,186 |
| 50619 | Clarksville | 2,150 |
| 50604 | Aplington | 1,590 |
| 50602 | Allison | 1,254 |
| 50660 | New Hartford | 1,143 |
| 50625 | Dumont | 930 |
| 50611 | Bristow | 364 |
| 50608 | Austinville | 24 |
| 50649 | Kesley | 12 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Butler County, Iowa (US Census).