14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Houghton Lake | 1 | 6,145 | 5,596 | 3.05% | 572 | 10.75 | CDP |
| Denton township | 2 | 5,482 | 5,294 | 0.79% | 209 | 26.25 | Township |
| Roscommon township | 3 | 4,570 | 4,394 | 0.91% | 44 | 103.56 | Township |
| Richfield township | 4 | 3,631 | 3,553 | 0.58% | 53 | 68.98 | Township |
| Gerrish township | 5 | 2,893 | 2,794 | 0.84% | 105 | 27.60 | Township |
| St. Helen | 6 | 2,861 | 2,868 | 0.46% | 499 | 5.73 | CDP |
| Markey township | 7 | 2,473 | 2,397 | 0.82% | 86 | 28.73 | Township |
| Higgins township | 8 | 1,910 | 1,873 | 0.53% | 27 | 70.36 | Township |
| Prudenville | 9 | 1,344 | 1,755 | -1.68% | 471 | 2.85 | CDP |
| Lyon township | 10 | 1,288 | 1,256 | 0.63% | 43 | 29.98 | Township |
| Roscommon | 11 | 993 | 982 | 0.2% | 603 | 1.65 | Village |
| Backus township | 12 | 305 | 291 | 0.66% | 9 | 34.37 | Township |
| Nester township | 13 | 278 | 263 | 1.09% | 4 | 71.34 | Township |
| Au Sable township | 14 | 244 | 236 | 0.83% | 7 | 35.66 | Township |
Houghton Lake is the largest city in Roscommon County, with a population of 6,145.
Au Sable township is the smallest city in Roscommon County.
There are 14 cities in Roscommon County, Michigan.