Founded in 1831, Gratiot County is one of 83 counties in the state of Michigan. Historically, Gratiot County was formed from unorganized territory. The city of Ithaca is the county seat. With FIPS code of 57, Gratiot County has a population of 41,544 and area of 572 square miles (1,481 km2).
List of all cities in Gratiot County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Alma, MI | 48801 | 989 |
| 48802 | 989 | |
| Ashley, MI | 48806 | 989 |
| Bannister, MI | 48807 | 989 |
| Breckenridge, MI | 48615 | 989 |
| Elm Hall, MI | 48830 | 989 |
| Elwell, MI | 48832 | 989 |
| Ithaca, MI | 48847 | 989 |
| Middleton, MI | 48856 | 989 |
| North Star, MI | 48862 | 989 |
| Perrinton, MI | 48871 | 989 |
| Pompeii, MI | 48874 | 989 |
| Riverdale, MI | 48877 | 989 |
| Saint Louis, MI | 48880 | 989 |
| Sumner, MI | 48889 | 989 |
| Total Petroleum, MI | 48802 | 989 |
| Wheeler, MI | 48662 | 989 |