| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ontonagon | 1 | 2,264 | 2,252 | -0.57% | 12 | 194 | Township |
| Ontonagon | 2 | 1,266 | 1,260 | 0.16% | 343 | 4 | Village |
| Stannard | 3 | 633 | 641 | -0.94% | 5.0 | 125 | Township |
| Greenland | 4 | 616 | 631 | -1.28% | 5.0 | 113 | Township |
| Bergland | 5 | 443 | 437 | 0% | 5.0 | 97 | Township |
| McMillan | 6 | 400 | 408 | -1.23% | 6.0 | 71 | Township |
| Interior | 7 | 266 | 269 | -1.12% | 3.0 | 86 | Township |
| Rockland | 8 | 222 | 221 | -0.45% | 2.0 | 93 | Township |
| Haight | 9 | 203 | 205 | -0.98% | 2.0 | 106 | Township |
| Matchwood | 10 | 82 | 83 | -1.2% | 1.0 | 109 | Township |
| Bohemia | 11 | 71 | 72 | -1.39% | 1.0 | 92 | Township |
Ontonagon is the largest city in Ontonagon County, with a population of 2,264.
Bohemia is the smallest city in Ontonagon County, with a population of 71.
There are 11 cities in Ontonagon County, Michigan.