21 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hettinger | 1 | 1,029 | 1,063 | -0.68% | 1,241 | 0.83 | City |
| Hettinger township | 2 | 187 | 184 | 1.63% | 5 | 34.89 | Township |
| Reeder | 3 | 122 | 126 | -0.81% | 178 | 0.69 | City |
| Scott township | 4 | 116 | 113 | 1.75% | 3 | 35.84 | Township |
| Clermont township | 5 | 46 | 44 | 2.22% | 1 | 35.89 | Township |
| Wolf Butte township | 6 | 46 | 44 | 2.22% | 1 | 35.89 | Township |
| Reeder township | 7 | 33 | 34 | 0% | 1 | 34.99 | Township |
| Bucyrus township | 8 | 30 | 31 | 0% | 1 | 35.58 | Township |
| Taylor Butte township | 9 | 22 | 20 | 4.76% | 1 | 35.89 | Township |
| Cedar township | 10 | 21 | 19 | 5% | 1 | 31.65 | Township |
| Duck Creek township | 11 | 21 | 22 | 0% | 1 | 35.93 | Township |
| Gilstrap township | 12 | 21 | 22 | 0% | 1 | 35.95 | Township |
| Darling Springs township | 13 | 20 | 21 | 0% | 1 | 31.08 | Township |
| Orange township | 14 | 19 | 17 | 5.56% | 1 | 35.84 | Township |
| Lightning Creek township | 15 | 18 | 16 | 5.88% | 0.00 | 36.06 | Township |
| Bucyrus | 16 | 15 | 15 | 0% | 43 | 0.35 | City |
| Haynes | 17 | 15 | 15 | 0% | 111 | 0.14 | City |
| South Fork township | 18 | 14 | 14 | 0% | 0.00 | 36.10 | Township |
| Chandler township | 19 | 13 | 13 | 0% | 0.00 | 35.99 | Township |
| Beisigl township | 20 | 12 | 12 | 0% | 0.00 | 35.98 | Township |
| Maine township | 21 | 11 | 11 | 0% | 0.00 | 31.71 | Township |
Hettinger is the largest city in Adams County, with a population of 1,029.
Maine township is the smallest city in Adams County.
There are 21 cities in Adams County, North Dakota.