29 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fargo | 1 | 137,989 | 125,986 | 1.77% | 2,715 | 50.83 | City |
| West Fargo | 2 | 41,403 | 38,895 | 1.23% | 2,560 | 16.18 | City |
| Horace | 3 | 7,239 | 3,249 | 12.39% | 572 | 12.67 | City |
| Casselton | 4 | 2,468 | 2,478 | -0.08% | 1,142 | 2.16 | City |
| Mapleton | 5 | 1,505 | 1,330 | 2.38% | 385 | 3.91 | City |
| Kindred | 6 | 1,086 | 930 | 2.94% | 749 | 1.45 | City |
| Reile's Acres | 7 | 925 | 715 | 4.76% | 815 | 1.14 | City |
| Harwood | 8 | 847 | 797 | 1.2% | 650 | 1.30 | City |
| Argusville | 9 | 467 | 484 | -0.64% | 117 | 4 | City |
| Oxbow | 10 | 367 | 376 | -0.54% | 240 | 1.53 | City |
| Hunter | 11 | 323 | 333 | -0.61% | 216 | 1.49 | City |
| Arthur | 12 | 322 | 326 | -0.31% | 210 | 1.53 | City |
| Tower City | 13 | 280 | 267 | 1.08% | 137 | 2.05 | City |
| Davenport | 14 | 254 | 254 | 0% | 934 | 0.27 | City |
| Leonard | 15 | 242 | 247 | -0.41% | 322 | 0.75 | City |
| Grandin | 16 | 201 | 186 | 1.52% | 1,110 | 0.18 | City |
| Brooktree Park | 17 | 195 | 218 | 7.14% | 1,108 | 0.18 | CDP |
| Frontier | 18 | 191 | 196 | -0.52% | 1,016 | 0.19 | City |
| Page | 19 | 187 | 192 | -0.53% | 186 | 1 | City |
| Buffalo | 20 | 184 | 193 | -1.07% | 383 | 0.48 | City |
| Gardner | 21 | 125 | 129 | -0.79% | 252 | 0.50 | City |
| Amenia | 22 | 83 | 85 | 0% | 56 | 1.49 | City |
| Wheatland | 23 | 72 | 31 | 5.88% | 18 | 4.01 | CDP |
| Erie | 24 | 59 | 29 | 7.27% | 29 | 2 | CDP |
| North River | 25 | 55 | 57 | 0% | 902 | 0.06 | City |
| Prairie Rose | 26 | 54 | 56 | 0% | 1,317 | 0.04 | City |
| Briarwood | 27 | 52 | 54 | 0% | 364 | 0.14 | City |
| Embden | 28 | 40 | 26 | 8.11% | 56 | 0.72 | CDP |
| Ayr | 29 | 11 | 11 | 0% | 129 | 0.09 | City |
Fargo is the largest city in Cass County, with a population of 137,989.
Ayr is the smallest city in Cass County.
There are 29 cities in Cass County, North Dakota.