Founded in 1829, St. Joseph County is one of 83 counties in the state of Michigan. Historically, St. Joseph County was formed from unorganized territory. The city of Centreville is the county seat. With FIPS code of 149, St. Joseph County has a population of 60,758 and area of 521 square miles (1,349 km2).
List of all cities in Saint Joseph County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Burr Oak, MI | 49030 | 269 |
| Centreville, MI | 49032 | 269 |
| Colon, MI | 49040 | 269 |
| Constantine, MI | 49042 | 269 |
| Leonidas, MI | 49066 | 269 |
| Mendon, MI | 49072 | 269 |
| Mottville, MI | 49099 | 269 |
| Nottawa, MI | 49075 | 269 |
| Sturgis, MI | 49091 | 269 |
| Three Rivers, MI | 49093 | 269 |
| White Pigeon, MI | 49099 | 269 |