20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ludington | 1 | 7,565 | 7,644 | -0.21% | 2,251 | 3.36 | City |
| Hamlin township | 2 | 3,729 | 3,706 | -0.27% | 136 | 27.45 | Township |
| Amber township | 3 | 2,543 | 2,532 | -0.31% | 92 | 27.56 | Township |
| Pere Marquette charter township | 4 | 2,393 | 2,419 | -0.58% | 170 | 14.09 | Township |
| Victory township | 5 | 1,411 | 1,405 | -0.28% | 39 | 35.93 | Township |
| Branch township | 6 | 1,407 | 1,402 | -0.28% | 40 | 35.40 | Township |
| Scottville | 7 | 1,357 | 1,354 | 0.07% | 911 | 1.49 | City |
| Custer township | 8 | 1,308 | 1,320 | -0.68% | 37 | 34.91 | Township |
| Riverton township | 9 | 1,232 | 1,234 | -0.4% | 35 | 35.22 | Township |
| Custer township | 10 | 1,211 | 1,155 | 0.5% | 35 | 34.72 | Township |
| Sherman township | 11 | 1,135 | 1,130 | -0.26% | 31 | 36.23 | Township |
| Summit township | 12 | 986 | 990 | -0.5% | 77 | 12.80 | Township |
| Custer township | 13 | 908 | 901 | 0% | 26 | 35.31 | Township |
| Free Soil township | 14 | 844 | 840 | -0.24% | 22 | 38.64 | Township |
| Eden township | 15 | 594 | 587 | 0% | 17 | 35.41 | Township |
| Logan township | 16 | 337 | 331 | 0% | 9 | 36.06 | Township |
| Custer | 17 | 294 | 293 | 0% | 276 | 1.06 | Village |
| Fountain | 18 | 183 | 180 | 0.55% | 179 | 1.02 | Village |
| Meade township | 19 | 178 | 179 | -0.56% | 5 | 37.41 | Township |
| Free Soil | 20 | 150 | 150 | 0% | 145 | 1.04 | Village |
Ludington is the largest city in Mason County, with a population of 7,565.
Free Soil is the smallest city in Mason County.
There are 20 cities in Mason County, Michigan.