11 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ontonagon | 1 | 2,255 | 2,253 | -0.44% | 12 | 194 | Township |
| Ontonagon | 2 | 1,262 | 1,261 | 0% | 342 | 4 | Village |
| Stannard | 3 | 631 | 642 | -0.79% | 5 | 125 | Township |
| Greenland | 4 | 621 | 632 | -0.64% | 6 | 113 | Township |
| Bergland | 5 | 437 | 436 | -0.23% | 4 | 97 | Township |
| McMillan | 6 | 397 | 407 | -1% | 6 | 71 | Township |
| Interior | 7 | 262 | 269 | -1.13% | 3 | 86 | Township |
| Rockland | 8 | 224 | 222 | 0% | 2 | 93 | Township |
| Haight | 9 | 204 | 206 | -0.49% | 2 | 106 | Township |
| Matchwood | 10 | 80 | 82 | -1.23% | 1 | 109 | Township |
| Bohemia | 11 | 70 | 72 | -1.41% | 1 | 92 | Township |
Ontonagon is the largest city in Ontonagon County, with a population of 2,255.
Bohemia is the smallest city in Ontonagon County, with a population of 70.
There are 11 cities in Ontonagon County, Michigan.