40 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hillsboro | 1 | 2,660 | 2,730 | -0.52% | 1,090 | 2.44 | City |
| Marion | 2 | 1,883 | 1,920 | -0.37% | 683 | 2.76 | City |
| Marion township | 3 | 1,111 | 1,106 | -0.18% | 11 | 99.78 | Township |
| Peabody township | 4 | 1,079 | 1,121 | -1.1% | 30 | 36.31 | Township |
| West Branch township | 5 | 990 | 1,015 | -1% | 28 | 35.50 | Township |
| Peabody | 6 | 908 | 938 | -0.66% | 717 | 1.27 | City |
| Marion township | 7 | 882 | 839 | 1.03% | 12 | 71.13 | Township |
| Goessel | 8 | 551 | 556 | -0.18% | 1,454 | 0.38 | City |
| Centre township | 9 | 463 | 470 | -0.64% | 9 | 49.02 | Township |
| Clear Creek township | 10 | 440 | 444 | -0.45% | 6 | 75.63 | Township |
| Marion township | 11 | 394 | 414 | -1.25% | 11 | 36.16 | Township |
| Florence | 12 | 379 | 391 | -0.52% | 495 | 0.77 | City |
| Menno township | 13 | 322 | 322 | 0% | 9 | 36 | Township |
| Lehigh township | 14 | 315 | 314 | -0.32% | 9 | 36.02 | Township |
| Gale township | 15 | 237 | 241 | -0.84% | 9 | 26.94 | Township |
| Burns | 16 | 230 | 235 | -0.43% | 669 | 0.34 | City |
| Marion township | 17 | 220 | 218 | 0.46% | 13 | 17.59 | Township |
| Risley township | 18 | 210 | 215 | -0.94% | 6 | 33.98 | Township |
| Durham Park township | 19 | 207 | 213 | -0.96% | 6 | 35.44 | Township |
| Catlin township | 20 | 179 | 183 | -1.1% | 5 | 35.98 | Township |
| East Branch township | 21 | 177 | 181 | -1.12% | 5 | 35.34 | Township |
| Blaine township | 22 | 168 | 173 | -0.59% | 5 | 35.64 | Township |
| Lincolnville | 23 | 167 | 167 | 0% | 742 | 0.23 | City |
| Colfax township | 24 | 166 | 166 | 0% | 5 | 35.84 | Township |
| Lost Springs township | 25 | 164 | 167 | -0.61% | 5 | 35.91 | Township |
| Lehigh | 26 | 161 | 158 | 0.63% | 500 | 0.32 | City |
| Clark township | 27 | 136 | 137 | -0.73% | 4 | 35.90 | Township |
| Grant township | 28 | 121 | 122 | -0.82% | 2 | 66.91 | Township |
| Tampa | 29 | 103 | 107 | -0.96% | 579 | 0.18 | City |
| Marion township | 30 | 97 | 97 | 0% | 3 | 35.47 | Township |
| Durham | 31 | 92 | 92 | 0% | 529 | 0.17 | City |
| Fairplay township | 32 | 89 | 91 | -1.11% | 2 | 45.07 | Township |
| Pilsen | 33 | 78 | 77 | 8.33% | 56 | 1.40 | CDP |
| Ramona | 34 | 78 | 78 | 0% | 268 | 0.29 | City |
| Moore township | 35 | 73 | 74 | 0% | 2 | 35.99 | Township |
| Summit township | 36 | 65 | 66 | 0% | 2 | 35.88 | Township |
| Lost Springs | 37 | 53 | 55 | 0% | 239 | 0.22 | City |
| Doyle township | 38 | 38 | 41 | -2.56% | 1 | 37.58 | Township |
| Eastshore | 39 | 21 | 26 | 5% | 22 | 0.96 | CDP |
| Durham township | 40 | 15 | 15 | 0% | 0.00 | 35.77 | Township |
Hillsboro is the largest city in Marion County, with a population of 2,660.
Durham township is the smallest city in Marion County.
There are 40 cities in Marion County, Kansas.