21 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Watford City | 1 | 5,866 | 6,250 | -1.3% | 653 | 8.98 | City |
| Mandaree | 2 | 706 | 500 | 1% | 63 | 11.13 | CDP |
| Yellowstone township | 3 | 465 | 453 | 2.88% | 12 | 40.14 | Township |
| Alex township | 4 | 301 | 285 | 3.44% | 9 | 34.64 | Township |
| Alexander | 5 | 299 | 319 | -1.32% | 241 | 1.24 | City |
| Twin Valley township | 6 | 273 | 266 | 2.63% | 3 | 79.15 | Township |
| Arnegard | 7 | 264 | 284 | -1.49% | 776 | 0.34 | City |
| Tri township | 8 | 213 | 213 | 1.91% | 2 | 113.82 | Township |
| Arnegard township | 9 | 200 | 196 | 2.56% | 6 | 35.49 | Township |
| Four Bears Village | 10 | 185 | 247 | -10.63% | 181 | 1.02 | CDP |
| Sioux township | 11 | 168 | 161 | 3.7% | 3 | 64.35 | Township |
| Blue Butte township | 12 | 85 | 86 | 1.19% | 2 | 34.49 | Township |
| Elm Tree township | 13 | 60 | 57 | 3.45% | 2 | 39.03 | Township |
| Grail township | 14 | 55 | 50 | 5.77% | 2 | 31.65 | Township |
| Hawkeye township | 15 | 49 | 48 | 2.08% | 1 | 33.54 | Township |
| Charbon township | 16 | 48 | 45 | 4.35% | 1 | 35.78 | Township |
| Keene township | 17 | 45 | 45 | 2.27% | 1 | 36.88 | Township |
| Antelope Creek township | 18 | 36 | 36 | 2.86% | 1 | 35.94 | Township |
| Randolph township | 19 | 26 | 25 | 4% | 1 | 35.74 | Township |
| Alexander township | 20 | 19 | 19 | 0% | 1 | 35.63 | Township |
| Riverview township | 21 | 9 | 10 | 0% | 0.00 | 43.86 | Township |
Watford City is the largest city in McKenzie County, with a population of 5,866.
Riverview township is the smallest city in McKenzie County.
There are 21 cities in McKenzie County, North Dakota.