10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mandan | 1 | 24,834 | 24,214 | 0.5% | 1,837 | 13.52 | City |
| New Salem | 2 | 1,058 | 980 | 1.54% | 764 | 1.39 | City |
| Hebron | 3 | 781 | 798 | -0.38% | 520 | 1.50 | City |
| Glen Ullin | 4 | 719 | 733 | -0.42% | 706 | 1.02 | City |
| Harmon | 5 | 258 | 228 | 3.2% | 165 | 1.57 | CDP |
| Flasher | 6 | 213 | 217 | -0.47% | 334 | 0.64 | City |
| Captain's Landing township | 7 | 133 | 124 | 2.31% | 410 | 0.32 | Township |
| Almont | 8 | 99 | 96 | 1.02% | 40 | 2.49 | City |
| Mandan township | 9 | 56 | 61 | -1.75% | 2 | 34.17 | Township |
| Hebron township | 10 | 47 | 41 | 6.82% | 1 | 50.43 | Township |
Mandan is the largest city in Morton County, with a population of 24,834.
Hebron township is the smallest city in Morton County.
There are 10 cities in Morton County, North Dakota.