Founded on Jan 15, 1851, Butler County is one of 99 counties in the state of Iowa. Historically, Butler County was formed from Black Hawk County and Buchanan County. The city of Allison is the county seat. With FIPS code of 23, Butler County has a population of 14,332 and area of 580 square miles (1,502 km2).
List of all cities in Butler County, IA alphabetically
| City/Town | Postal Code | Area Code |
| Allison, IA | 50602 | 319 |
| Aplington, IA | 50604 | 319 |
| Aredale, IA | 50605 | 641 |
| Austinville, IA | 50608 | 319 |
| Bristow, IA | 50611 | 641 |
| Clarksville, IA | 50619 | 319 |
| Dumont, IA | 50625 | 641 |
| Fern, IA | 50665 | 319 |
| Greene, IA | 50636 | 641 |
| Kesley, IA | 50649 | 319 |
| New Hartford, IA | 50660 | 319 |
| Packard, IA | 50619 | 319 |
| Parkersburg, IA | 50665 | 319 |
| Powersville, IA | 50636 | 641 |
| Shell Rock, IA | 50670 | 319 |
| Sinclair, IA | 50665 | 319 |