Founded in 1829, Calhoun County is one of 83 counties in the state of Michigan. Historically, Calhoun County was formed from unorganized territory. The city of Marshall is the county seat. With FIPS code of 25, Calhoun County has a population of 133,819 and area of 718 square miles (1,860 km2).
List of all cities in Calhoun County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Albion, MI | 49224 | 517 |
| Athens, MI | 49011 | 269 |
| Battle Creek, MI | 49014 | 269 |
| 49015 | 269 | |
| 49016 | 269 | |
| 49017 | 269 | |
| 49018 | 269 | |
| 49037 | 269 | |
| Bedford, MI | 49020 | 269 |
| Burlington, MI | 49029 | 517 |
| Ceresco, MI | 49033 | 269 |
| East Leroy, MI | 49051 | 269 |
| Homer, MI | 49245 | 517 |
| Marshall, MI | 49068 | 269 |
| 49069 | 269 | |
| Springfield, MI | 49015 | 269 |
| 49037 | 269 | |
| State Farm Ins, MI | 49069 | 269 |
| Tekonsha, MI | 49092 | 517 |