20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Alma | 1 | 9,293 | 9,470 | -0.38% | 1,577 | 5.89 | City |
| St. Louis | 2 | 7,012 | 7,001 | 0.03% | 2,115 | 3.31 | City |
| Ithaca | 3 | 2,790 | 2,847 | -0.39% | 487 | 5.72 | City |
| Wheeler township | 4 | 2,597 | 2,608 | 0.23% | 72 | 35.88 | Township |
| Pine River township | 5 | 2,359 | 2,346 | 0.47% | 78 | 30.35 | Township |
| Seville township | 6 | 2,129 | 2,126 | 0.38% | 60 | 35.54 | Township |
| Sumner township | 7 | 1,870 | 1,859 | 0.48% | 52 | 35.65 | Township |
| Bethany township | 8 | 1,752 | 1,767 | 0.06% | 50 | 34.70 | Township |
| Arcada township | 9 | 1,662 | 1,670 | 0.24% | 52 | 32.17 | Township |
| Elba township | 10 | 1,287 | 1,288 | 0.31% | 37 | 34.99 | Township |
| Breckenridge | 11 | 1,255 | 1,275 | -0.32% | 1,181 | 1.06 | Village |
| Newark township | 12 | 1,112 | 1,111 | 0.45% | 32 | 34.34 | Township |
| North Star township | 13 | 887 | 899 | 0% | 26 | 33.69 | Township |
| Emerson township | 14 | 836 | 848 | 0% | 24 | 34.15 | Township |
| North Shade township | 15 | 552 | 559 | 0% | 16 | 35.61 | Township |
| Lafayette township | 16 | 511 | 517 | 0% | 14 | 36 | Township |
| Ashley | 17 | 509 | 514 | -0.2% | 760 | 0.67 | Village |
| Perrinton | 18 | 391 | 391 | 0% | 619 | 0.63 | Village |
| Riverdale | 19 | 279 | 296 | 7.31% | 404 | 0.69 | CDP |
| Elm Hall | 20 | 251 | 165 | 7.26% | 180 | 1.40 | CDP |
Alma is the largest city in Gratiot County, with a population of 9,293.
Elm Hall is the smallest city in Gratiot County.
There are 20 cities in Gratiot County, Michigan.