9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mandan | 1 | 24,929 | 24,223 | 0.57% | 1,844 | 14 | City |
| New Salem | 2 | 1,089 | 981 | 1.97% | 786 | 1 | City |
| Hebron | 3 | 785 | 798 | -0.38% | 523 | 2 | City |
| Glen Ullin | 4 | 698 | 731 | -0.99% | 686 | 1 | City |
| Flasher | 5 | 233 | 218 | 1.3% | 365 | 1 | City |
| Captain's Landing | 6 | 132 | 125 | 1.54% | 407 | 0 | Township |
| Almont | 7 | 98 | 95 | 0% | 39 | 2 | City |
| Mandan | 8 | 63 | 61 | 3.28% | 2 | 34 | Township |
| Hebron | 9 | 52 | 43 | 8.33% | 1 | 50 | Township |
Mandan is the largest city in Morton County, with a population of 24,929.
Hebron is the smallest city in Morton County, with a population of 52.
There are 9 cities in Morton County, North Dakota.