19 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ontonagon township | 1 | 2,299 | 2,253 | -0.09% | 12 | 193.85 | Township |
| Ontonagon | 2 | 1,294 | 1,263 | 0.47% | 350 | 3.69 | Village |
| Stannard township | 3 | 642 | 640 | -0.47% | 5 | 124.92 | Township |
| Greenland township | 4 | 631 | 633 | -0.63% | 6 | 112.56 | Township |
| Bergland township | 5 | 443 | 437 | -0.23% | 5 | 97.45 | Township |
| McMillan township | 6 | 412 | 409 | -0.24% | 6 | 70.90 | Township |
| White Pine | 7 | 400 | 446 | -1.23% | 80 | 5 | CDP |
| Ewen | 8 | 379 | 267 | 7.06% | 450 | 0.84 | CDP |
| Bruce Crossing | 9 | 321 | 347 | 7% | 71 | 4.51 | CDP |
| Interior township | 10 | 274 | 269 | 0% | 3 | 86.39 | Township |
| Rockland | 11 | 242 | 207 | 7.08% | 549 | 0.44 | CDP |
| Rockland township | 12 | 225 | 222 | -0.44% | 2 | 92.87 | Township |
| Mass City | 13 | 224 | 170 | 7.18% | 416 | 0.54 | CDP |
| Haight township | 14 | 208 | 207 | -0.48% | 2 | 105.65 | Township |
| Greenland | 15 | 161 | 124 | 7.33% | 391 | 0.41 | CDP |
| Lake Gogebic | 16 | 146 | 129 | 7.35% | 135 | 1.08 | CDP |
| Bergland | 17 | 139 | 111 | 6.92% | 190 | 0.73 | CDP |
| Matchwood township | 18 | 84 | 83 | 0% | 1 | 108.76 | Township |
| Bohemia township | 19 | 71 | 70 | 0% | 1 | 91.66 | Township |
Ontonagon township is the largest city in Ontonagon County, with a population of 2,299.
Bohemia township is the smallest city in Ontonagon County.
There are 19 cities in Ontonagon County, Michigan.