36 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lexington township | 1 | 3,447 | 3,462 | -0.17% | 96 | 35.97 | Township |
| Worth township | 2 | 3,436 | 3,468 | -0.29% | 89 | 38.60 | Township |
| Sandusky | 3 | 2,673 | 2,703 | -0.22% | 1,245 | 2.15 | City |
| Sanilac township | 4 | 2,287 | 2,293 | -0.13% | 56 | 40.77 | Township |
| Croswell | 5 | 2,285 | 2,312 | -0.22% | 969 | 2.36 | City |
| Marlette | 6 | 1,851 | 1,855 | -0.05% | 1,146 | 1.61 | City |
| Marlette township | 7 | 1,660 | 1,681 | -0.36% | 32 | 52.46 | Township |
| Elk township | 8 | 1,487 | 1,512 | -0.54% | 42 | 35.67 | Township |
| Speaker township | 9 | 1,332 | 1,344 | -0.3% | 39 | 34.55 | Township |
| Brown City | 10 | 1,290 | 1,302 | -0.15% | 1,138 | 1.13 | City |
| Watertown township | 11 | 1,241 | 1,251 | -0.24% | 35 | 35.05 | Township |
| Buel township | 12 | 1,161 | 1,161 | -0.09% | 31 | 37.63 | Township |
| Maple Valley township | 13 | 1,159 | 1,175 | -0.43% | 34 | 34.48 | Township |
| Moore township | 14 | 1,086 | 1,104 | -0.46% | 30 | 36.30 | Township |
| Flynn township | 15 | 998 | 1,003 | -0.2% | 28 | 35.81 | Township |
| Evergreen township | 16 | 959 | 961 | -0.1% | 27 | 35.35 | Township |
| Lexington | 17 | 932 | 919 | 0.32% | 674 | 1.38 | Village |
| Deckerville | 18 | 874 | 883 | -0.23% | 701 | 1.25 | Village |
| Forester township | 19 | 872 | 877 | -0.23% | 35 | 25.24 | Township |
| Greenleaf township | 20 | 808 | 816 | -0.25% | 22 | 35.92 | Township |
| Delaware township | 21 | 773 | 783 | -0.39% | 17 | 46.44 | Township |
| Lamotte township | 22 | 756 | 764 | -0.26% | 21 | 35.45 | Township |
| Bridgehampton township | 23 | 735 | 739 | -0.14% | 20 | 36.11 | Township |
| Elmer township | 24 | 708 | 721 | -0.56% | 19 | 36.33 | Township |
| Argyle township | 25 | 679 | 686 | -0.29% | 19 | 36.31 | Township |
| Austin township | 26 | 607 | 613 | -0.33% | 17 | 36.15 | Township |
| Peck | 27 | 595 | 602 | -0.17% | 572 | 1.04 | Village |
| Port Sanilac | 28 | 565 | 570 | -0.18% | 664 | 0.85 | Village |
| Minden township | 29 | 548 | 554 | -0.36% | 15 | 36.10 | Township |
| Carsonville | 30 | 498 | 502 | -0.2% | 430 | 1.16 | Village |
| Wheatland township | 31 | 414 | 417 | -0.24% | 11 | 36.34 | Township |
| Applegate | 32 | 223 | 227 | -0.45% | 222 | 1 | Village |
| Snover | 33 | 213 | 300 | -6.99% | 62 | 3.42 | CDP |
| Minden City | 34 | 182 | 182 | 0% | 185 | 0.99 | Village |
| Melvin | 35 | 150 | 154 | -0.66% | 154 | 0.97 | Village |
| Forestville | 36 | 84 | 86 | 0% | 106 | 0.79 | Village |
Lexington township is the largest city in Sanilac County, with a population of 3,447.
Forestville is the smallest city in Sanilac County.
There are 36 cities in Sanilac County, Michigan.