30 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gwinner | 1 | 909 | 926 | -0.33% | 441 | 2.06 | City |
| Milnor | 2 | 610 | 620 | -0.33% | 609 | 1 | City |
| Forman | 3 | 483 | 510 | -1.02% | 620 | 0.78 | City |
| Rutland | 4 | 158 | 163 | -0.63% | 408 | 0.39 | City |
| Hall township | 5 | 112 | 116 | -0.88% | 3 | 36 | Township |
| Milnor township | 6 | 109 | 113 | -0.91% | 3 | 32.55 | Township |
| Vivian township | 7 | 93 | 92 | 0% | 3 | 35.07 | Township |
| Dunbar township | 8 | 87 | 90 | -1.14% | 2 | 36.07 | Township |
| Kingston township | 9 | 86 | 89 | -1.15% | 2 | 41.93 | Township |
| Willey township | 10 | 86 | 89 | -1.15% | 2 | 35.50 | Township |
| Whitestone Hill township | 11 | 77 | 76 | -1.28% | 2 | 33.20 | Township |
| Ransom township | 12 | 73 | 76 | -1.35% | 2 | 35.04 | Township |
| Cogswell | 13 | 69 | 71 | 0% | 209 | 0.33 | City |
| Havana | 14 | 68 | 67 | 0% | 180 | 0.38 | City |
| Denver township | 15 | 62 | 62 | 0% | 2 | 34.86 | Township |
| Bowen township | 16 | 61 | 62 | 0% | 2 | 35.62 | Township |
| Weber township | 17 | 61 | 61 | 0% | 2 | 39.72 | Township |
| Shuman township | 18 | 58 | 59 | 0% | 2 | 34.93 | Township |
| Herman township | 19 | 53 | 54 | 0% | 1 | 35.91 | Township |
| Rutland township | 20 | 52 | 53 | 0% | 1 | 35.42 | Township |
| Forman township | 21 | 50 | 51 | 0% | 1 | 35.32 | Township |
| Brampton township | 22 | 48 | 49 | 0% | 1 | 36.26 | Township |
| Tewaukon township | 23 | 40 | 41 | 0% | 1 | 37.50 | Township |
| Cayuga | 24 | 37 | 39 | 0% | 37 | 1 | City |
| Jackson township | 25 | 35 | 36 | 0% | 1 | 35.82 | Township |
| Harlem township | 26 | 29 | 32 | -3.33% | 1 | 36.03 | Township |
| Verner township | 27 | 29 | 32 | -3.33% | 1 | 35.38 | Township |
| Sargent township | 28 | 25 | 28 | -3.85% | 1 | 36.01 | Township |
| Marboe township | 29 | 23 | 23 | 0% | 1 | 26.35 | Township |
| Southwest township | 30 | 13 | 13 | 0% | 0.00 | 36.01 | Township |
Gwinner is the largest city in Sargent County, with a population of 909.
Southwest township is the smallest city in Sargent County.
There are 30 cities in Sargent County, North Dakota.