25 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Frenchtown | 1 | 21,810 | 21,606 | 0.18% | 522 | 42 | Township |
| Monroe | 2 | 20,040 | 20,451 | -0.34% | 2,215 | 9 | City |
| Monroe charter | 3 | 14,372 | 14,379 | 0.17% | 852 | 17 | Township |
| Woodhaven | 4 | 12,417 | 12,891 | -0.63% | 1,944 | 6 | City |
| Berlin charter | 5 | 10,123 | 9,895 | 0.39% | 316 | 32 | Township |
| Dundee | 6 | 8,847 | 8,169 | 0.35% | 183 | 48 | Township |
| Ash | 7 | 8,081 | 7,874 | 0.45% | 234 | 35 | Township |
| Dundee | 8 | 6,319 | 5,380 | 2.55% | 1,205 | 5 | Village |
| Raisinville | 9 | 6,231 | 5,915 | 1.25% | 129 | 48 | Township |
| Milan | 10 | 6,037 | 6,070 | -0.08% | 1,736 | 3 | City |
| Ida | 11 | 4,833 | 4,788 | 0.19% | 132 | 37 | Township |
| Whiteford | 12 | 4,646 | 4,612 | 0.15% | 117 | 40 | Township |
| La Salle | 13 | 4,602 | 4,642 | 0.04% | 173 | 27 | Township |
| Erie | 14 | 4,373 | 4,304 | 0.23% | 183 | 24 | Township |
| Exeter | 15 | 4,061 | 3,930 | 1.1% | 111 | 37 | Township |
| Summerfield | 16 | 3,199 | 3,184 | 0.06% | 76 | 42 | Township |
| London | 17 | 3,020 | 2,991 | 0.27% | 84 | 36 | Township |
| Carleton | 18 | 2,286 | 2,333 | -0.35% | 2,307 | 1 | Village |
| South Rockwood | 19 | 1,576 | 1,597 | -0.19% | 481 | 3 | Village |
| Milan | 20 | 1,552 | 1,565 | 0% | 46 | 34 | Township |
| Luna Pier | 21 | 1,347 | 1,377 | -0.37% | 903 | 1 | City |
| Petersburg | 22 | 1,157 | 1,172 | -0.17% | 2,395 | 0 | City |
| Maybee | 23 | 597 | 545 | 1.53% | 324 | 2 | Village |
| Estral Beach | 24 | 415 | 420 | -0.24% | 943 | 0 | Village |
| Monroe | 25 | 347 | 330 | 0.87% | 10 | 36 | Township |
Frenchtown is the largest city in Monroe County, with a population of 21,810.
Monroe is the smallest city in Monroe County, with a population of 347.
There are 25 cities in Monroe County, Michigan.