Founded in 1829, Hillsdale County is one of 83 counties in the state of Michigan. Historically, Hillsdale County was formed from unorganized territory. The city of Hillsdale is the county seat. With FIPS code of 59, Hillsdale County has a population of 45,546 and area of 607 square miles (1,572 km2).
List of all cities in Hillsdale County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Allen, MI | 49227 | 517 |
| Camden, MI | 49232 | 517 |
| Cement City, MI | 49281 | 517 |
| Frontier, MI | 49239 | 517 |
| Hillsdale, MI | 49242 | 517 |
| Jerome, MI | 49249 | 517 |
| Jonesville, MI | 49250 | 517 |
| Litchfield, MI | 49252 | 517 |
| Moscow, MI | 49257 | 517 |
| Mosherville, MI | 49258 | 517 |
| North Adams, MI | 49262 | 517 |
| Osseo, MI | 49266 | 517 |
| Pittsford, MI | 49271 | 517 |
| Prattville, MI | 49271 | 517 |
| Reading, MI | 49274 | 517 |
| Somerset, MI | 49281 | 517 |
| Somerset Center, MI | 49282 | 517 |
| Waldron, MI | 49288 | 517 |