13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Iron River | 1 | 3,021 | 3,000 | 0.13% | 448 | 7 | City |
| Crystal Falls | 2 | 1,668 | 1,656 | -0.06% | 7 | 228 | Township |
| Crystal Falls | 3 | 1,603 | 1,592 | 0.12% | 459 | 3 | City |
| Stambaugh | 4 | 1,207 | 1,198 | -0.08% | 7 | 182 | Township |
| Iron River | 5 | 1,041 | 1,033 | -0.1% | 4 | 238 | Township |
| Bates | 6 | 939 | 930 | -0.11% | 7 | 126 | Township |
| Caspian | 7 | 819 | 811 | 0.12% | 574 | 1 | City |
| Mastodon | 8 | 585 | 578 | 0% | 5 | 127 | Township |
| Gaastra | 9 | 318 | 316 | 0% | 194 | 2 | City |
| Hematite | 10 | 272 | 270 | -0.37% | 2 | 153 | Township |
| Amasa | 11 | 251 | 242 | -0.79% | 62 | 4 | CDP |
| Mansfield | 12 | 238 | 235 | 0% | 2 | 99 | Township |
| Alpha | 13 | 125 | 123 | 0% | 133 | 1 | Village |
Iron River is the largest city in Iron County, with a population of 3,021.
Alpha is the smallest city in Iron County, with a population of 125.
There are 13 cities in Iron County, Michigan.