Founded on Jan 13, 1846, Decatur County is one of 99 counties in the state of Iowa. Historically, Decatur County was formed from Appanoose County. The city of Leon is the county seat. With FIPS code of 53, Decatur County has a population of 7,659 and area of 532 square miles (1,378 km2).
List of all cities in Decatur County, IA alphabetically
| City/Town | Postal Code | Area Code |
| Davis City, IA | 50065 | 641 |
| Decatur, IA | 50067 | 641 |
| Garden Grove, IA | 50103 | 641 |
| Grand River, IA | 50108 | 641 |
| High Point, IA | 50103 | 641 |
| Lamoni, IA | 50140 | 641 |
| Leon, IA | 50144 | 641 |
| Pleasanton, IA | 50065 | 641 |
| Van Wert, IA | 50262 | 641 |
| Weldon, IA | 50264 | 641 |
| Westerville, IA | 50108 | 641 |
| Woodland, IA | 50103 | 641 |