20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Center township | 1 | 1,693 | 1,661 | 0.71% | 27 | 62.54 | Township |
| Iowa township | 2 | 1,454 | 1,447 | 0.07% | 17 | 83.52 | Township |
| Wathena | 3 | 1,252 | 1,244 | 0.16% | 535 | 2.34 | City |
| Elwood | 4 | 1,126 | 1,115 | 0.18% | 387 | 2.91 | City |
| Troy | 5 | 970 | 959 | 0.21% | 995 | 0.97 | City |
| Highland | 6 | 926 | 916 | 0.22% | 1,734 | 0.53 | City |
| Highland township | 7 | 358 | 370 | -1.1% | 10 | 35.43 | Township |
| Wolf River township | 8 | 334 | 338 | 0% | 6 | 55.95 | Township |
| Union township | 9 | 266 | 266 | 0% | 7 | 36.06 | Township |
| Elwood township | 10 | 197 | 207 | -1.01% | 2 | 100.22 | Township |
| Wayne township | 11 | 188 | 188 | 0% | 5 | 36.65 | Township |
| Bendena | 12 | 134 | 126 | 0.75% | 88 | 1.53 | CDP |
| Troy township | 13 | 133 | 134 | 0% | 4 | 36.14 | Township |
| Denton | 14 | 129 | 129 | 0% | 890 | 0.14 | City |
| White Cloud | 15 | 117 | 117 | 0% | 162 | 0.72 | City |
| Highland township | 16 | 82 | 85 | -1.2% | 2 | 34.53 | Township |
| Severance | 17 | 76 | 78 | 0% | 543 | 0.14 | City |
| Highland township | 18 | 52 | 52 | 0% | 1 | 35.53 | Township |
| Highland township | 19 | 45 | 46 | 0% | 1 | 35.82 | Township |
| Highland township | 20 | 21 | 21 | 0% | 1 | 35.51 | Township |
Center township is the largest city in Doniphan County, with a population of 1,693.
Highland township is the smallest city in Doniphan County.
There are 20 cities in Doniphan County, Kansas.