Founded in 1840, Iosco County is one of 83 counties in the state of Michigan. Historically, Iosco County was formed from unorganized territory which was named Kanotin County until 1843. The city of Tawas City is the county seat. With FIPS code of 69, Iosco County has a population of 25,369 and area of 1,891 square miles (4,898 km2).
List of all cities in Iosco County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Au Sable, MI | 48750 | 989 |
| East Tawas, MI | 48730 | 989 |
| Hale, MI | 48739 | 989 |
| Long Lake, MI | 48743 | 989 |
| National City, MI | 48748 | 989 |
| Oscoda, MI | 48750 | 989 |
| Tawas City, MI | 48763 | 989 |
| 48764 | 989 | |
| Whittemore, MI | 48770 | 989 |