36 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Cutlerville | 1 | 20,509 | 17,988 | 2.03% | 3,576 | 5.74 | CDP |
| Dorr township | 2 | 7,971 | 7,934 | 0.2% | 221 | 36.15 | Township |
| Leighton township | 3 | 7,192 | 7,044 | 0.26% | 206 | 34.87 | Township |
| Laketown township | 4 | 6,276 | 5,952 | 0.67% | 291 | 21.56 | Township |
| Gun Plain township | 5 | 6,213 | 6,158 | 0.37% | 183 | 33.96 | Township |
| Otsego township | 6 | 6,104 | 5,914 | 0.76% | 183 | 33.27 | Township |
| Allegan | 7 | 5,126 | 5,215 | -0.35% | 1,333 | 3.85 | City |
| Dorr | 8 | 4,940 | 4,282 | 7.14% | 1,534 | 3.22 | CDP |
| Allegan township | 9 | 4,870 | 4,709 | 0.47% | 160 | 30.41 | Township |
| Wayland | 10 | 4,518 | 4,432 | 0.38% | 1,525 | 2.96 | City |
| Otsego | 11 | 4,016 | 4,110 | -0.47% | 1,977 | 2.03 | City |
| Heath township | 12 | 3,979 | 3,944 | 0.15% | 112 | 35.37 | Township |
| Lee township | 13 | 3,816 | 3,805 | 0.03% | 108 | 35.18 | Township |
| Plainwell | 14 | 3,721 | 3,786 | -0.35% | 1,793 | 2.08 | City |
| Saugatuck township | 15 | 3,704 | 3,464 | 1.48% | 160 | 23.13 | Township |
| Wayland township | 16 | 3,634 | 3,573 | 0.58% | 111 | 32.64 | Township |
| Manlius township | 17 | 3,415 | 3,319 | 0.65% | 97 | 35.19 | Township |
| Overisel township | 18 | 3,187 | 3,136 | 0.31% | 89 | 35.65 | Township |
| Martin township | 19 | 2,765 | 2,728 | 0.51% | 78 | 35.57 | Township |
| Fillmore township | 20 | 2,763 | 2,776 | -0.25% | 98 | 28.30 | Township |
| Hopkins township | 21 | 2,750 | 2,752 | 0.26% | 77 | 35.72 | Township |
| Ganges township | 22 | 2,667 | 2,574 | 0.87% | 83 | 32.05 | Township |
| Monterey township | 23 | 2,585 | 2,445 | 1.25% | 72 | 35.70 | Township |
| Trowbridge township | 24 | 2,569 | 2,531 | 0.63% | 74 | 34.65 | Township |
| Valley township | 25 | 2,371 | 2,221 | 1.15% | 72 | 32.92 | Township |
| Watson township | 26 | 2,306 | 2,179 | 1.45% | 65 | 35.32 | Township |
| Cheshire township | 27 | 2,241 | 2,211 | 0.27% | 64 | 34.82 | Township |
| Clyde township | 28 | 2,085 | 2,062 | 0.19% | 60 | 34.80 | Township |
| Hamilton township | 29 | 1,801 | 1,784 | -0.11% | 50 | 35.87 | Township |
| Fennville | 30 | 1,736 | 1,743 | -0.06% | 1,591 | 1.09 | City |
| Douglas | 31 | 1,435 | 1,374 | 0.84% | 807 | 1.78 | City |
| Hamilton township | 32 | 1,362 | 1,368 | -0.07% | 40 | 34.23 | Township |
| Saugatuck | 33 | 879 | 869 | 0.23% | 632 | 1.39 | City |
| Hopkins | 34 | 622 | 634 | -0.32% | 1,299 | 0.48 | Village |
| Hamilton township | 35 | 426 | 425 | 0.47% | 12 | 34.66 | Township |
| Martin | 36 | 397 | 406 | -0.5% | 518 | 0.77 | Village |
Cutlerville is the largest city in Allegan County, with a population of 20,509.
Martin is the smallest city in Allegan County.
There are 36 cities in Allegan County, Michigan.