13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Iron River | 1 | 3,048 | 3,008 | 0.26% | 452 | 6.74 | City |
| Crystal Falls township | 2 | 1,670 | 1,646 | 0.3% | 7 | 228.39 | Township |
| Crystal Falls | 3 | 1,620 | 1,600 | 0.25% | 464 | 3.49 | City |
| Stambaugh township | 4 | 1,216 | 1,197 | 0.33% | 7 | 181.51 | Township |
| Iron River township | 5 | 1,065 | 1,049 | 0.28% | 4 | 238.29 | Township |
| Bates township | 6 | 940 | 921 | 0.43% | 7 | 125.68 | Township |
| Caspian | 7 | 823 | 810 | 0.37% | 577 | 1.43 | City |
| Mastodon township | 8 | 590 | 579 | 0.34% | 5 | 126.58 | Township |
| Gaastra | 9 | 322 | 317 | 0.31% | 197 | 1.64 | City |
| Hematite township | 10 | 274 | 271 | 0% | 2 | 153.28 | Township |
| Amasa | 11 | 251 | 242 | -0.79% | 62 | 4.04 | CDP |
| Mansfield township | 12 | 243 | 236 | 0.83% | 2 | 99.08 | Township |
| Alpha | 13 | 124 | 123 | 0% | 132 | 0.94 | Village |
Iron River is the largest city in Iron County, with a population of 3,048.
Alpha is the smallest city in Iron County.
There are 13 cities in Iron County, Michigan.