14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Long Lake township | 1 | 10,065 | 9,950 | 0.18% | 337 | 29.90 | Township |
| Oscoda charter township | 2 | 7,132 | 7,129 | -0.4% | 58 | 122.02 | Township |
| Plainfield township | 3 | 3,329 | 3,352 | -0.42% | 32 | 103.73 | Township |
| East Tawas | 4 | 2,690 | 2,664 | 0.19% | 956 | 2.81 | City |
| Au Sable charter township | 5 | 2,014 | 2,016 | -0.4% | 96 | 21 | Township |
| Tawas City | 6 | 1,853 | 1,828 | 0.27% | 1,091 | 1.70 | City |
| Tawas township | 7 | 1,724 | 1,726 | -0.4% | 52 | 33.42 | Township |
| Oscoda | 8 | 922 | 733 | 0.22% | 1,060 | 0.87 | CDP |
| Burleigh township | 9 | 730 | 720 | -0.14% | 21 | 34.60 | Township |
| Wilber township | 10 | 720 | 716 | -0.28% | 10 | 72.43 | Township |
| Reno township | 11 | 629 | 622 | -0.16% | 18 | 35.27 | Township |
| Sherman township | 12 | 439 | 431 | 0% | 12 | 35.93 | Township |
| Alabaster township | 13 | 422 | 424 | -0.47% | 19 | 22.22 | Township |
| Whittemore | 14 | 420 | 415 | 0.24% | 410 | 1.02 | City |
Long Lake township is the largest city in Iosco County, with a population of 10,065.
Whittemore is the smallest city in Iosco County.
There are 14 cities in Iosco County, Michigan.