33 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Frenchtown township | 1 | 21,708 | 21,616 | 0.04% | 520 | 41.74 | Township |
| Monroe | 2 | 19,847 | 20,451 | -0.61% | 2,194 | 9.05 | City |
| Monroe charter township | 3 | 14,333 | 14,383 | -0.1% | 849 | 16.88 | Township |
| Woodhaven | 4 | 12,330 | 12,902 | -0.92% | 1,930 | 6.39 | City |
| Berlin charter township | 5 | 9,864 | 9,889 | -0.28% | 308 | 32.01 | Township |
| Lambertville | 6 | 9,819 | 9,970 | -0.09% | 1,457 | 6.74 | CDP |
| Temperance | 7 | 9,272 | 8,961 | 0.54% | 2,010 | 4.61 | CDP |
| Dundee township | 8 | 8,869 | 8,161 | 0.78% | 184 | 48.22 | Township |
| Ash township | 9 | 7,954 | 7,870 | 0.25% | 230 | 34.60 | Township |
| South Monroe | 10 | 6,714 | 6,194 | 0.27% | 2,765 | 2.43 | CDP |
| Dundee | 11 | 6,385 | 5,372 | 3.28% | 1,218 | 5.24 | Village |
| Raisinville township | 12 | 6,029 | 5,910 | 0.38% | 125 | 48.14 | Township |
| Milan | 13 | 5,970 | 6,067 | -0.32% | 1,717 | 3.48 | City |
| Ida township | 14 | 4,763 | 4,786 | -0.17% | 130 | 36.74 | Township |
| Whiteford township | 15 | 4,563 | 4,596 | -0.22% | 115 | 39.72 | Township |
| La Salle township | 16 | 4,513 | 4,640 | -0.59% | 170 | 26.57 | Township |
| Erie township | 17 | 4,236 | 4,304 | -0.33% | 177 | 23.88 | Township |
| Exeter township | 18 | 3,883 | 3,930 | -0.33% | 106 | 36.54 | Township |
| Summerfield township | 19 | 3,188 | 3,181 | 0.22% | 76 | 41.98 | Township |
| London township | 20 | 2,987 | 2,989 | 0.1% | 84 | 35.76 | Township |
| Woodland Beach | 21 | 2,735 | 2,502 | 1.67% | 5,260 | 0.52 | CDP |
| West Monroe | 22 | 2,734 | 3,261 | -1.87% | 2,185 | 1.25 | CDP |
| Carleton | 23 | 2,338 | 2,335 | 0.04% | 2,359 | 0.99 | Village |
| Detroit Beach | 24 | 2,242 | 2,128 | 0.45% | 3,605 | 0.62 | CDP |
| Stony Point | 25 | 1,913 | 1,624 | 0.68% | 1,576 | 1.21 | CDP |
| South Rockwood | 26 | 1,561 | 1,596 | -0.45% | 477 | 3.27 | Village |
| Milan township | 27 | 1,525 | 1,563 | -0.59% | 45 | 34 | Township |
| Luna Pier | 28 | 1,338 | 1,375 | -0.52% | 897 | 1.49 | City |
| Petersburg | 29 | 1,146 | 1,170 | -0.43% | 2,373 | 0.48 | City |
| Ida | 30 | 857 | 635 | 7.12% | 347 | 2.47 | CDP |
| Maybee | 31 | 531 | 546 | -0.56% | 288 | 1.84 | Village |
| Estral Beach | 32 | 407 | 419 | -0.49% | 925 | 0.44 | Village |
| Monroe township | 33 | 347 | 334 | 0.87% | 10 | 35.66 | Township |
Frenchtown township is the largest city in Monroe County, with a population of 21,708.
Monroe township is the smallest city in Monroe County.
There are 33 cities in Monroe County, Michigan.