9 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mandan | 1 | 25,070 | 24,223 | 0.57% | 1,855 | 14 | City |
| New Salem | 2 | 1,111 | 981 | 2.02% | 802 | 1 | City |
| Hebron | 3 | 783 | 798 | -0.25% | 521 | 2 | City |
| Glen Ullin | 4 | 692 | 731 | -0.86% | 680 | 1 | City |
| Flasher | 5 | 236 | 218 | 1.29% | 370 | 1 | City |
| Captain's Landing | 6 | 134 | 125 | 1.52% | 414 | 0 | Township |
| Almont | 7 | 99 | 95 | 1.02% | 40 | 2 | City |
| Mandan | 8 | 65 | 61 | 3.17% | 2 | 34 | Township |
| Hebron | 9 | 56 | 43 | 7.69% | 1 | 50 | Township |
Mandan is the largest city in Morton County, with a population of 25,070.
Hebron is the smallest city in Morton County, with a population of 56.
There are 9 cities in Morton County, North Dakota.