10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Liberal | 1 | 19,045 | 19,832 | -0.72% | 1,585 | 12 | City |
| Liberal | 2 | 19,045 | 19,739 | -0.72% | 1,585 | 12 | City |
| Fargo | 3 | 1,264 | 1,273 | 0.96% | 6 | 220 | Township |
| Fargo | 4 | 1,264 | 1,266 | 0.96% | 6 | 220 | Township |
| Liberal | 5 | 613 | 614 | 1.16% | 3 | 193 | Township |
| Liberal | 6 | 613 | 611 | 1.16% | 3 | 193 | Township |
| Kismet | 7 | 330 | 340 | -0.6% | 1,398 | 0 | City |
| Kismet | 8 | 330 | 338 | -0.6% | 1,398 | 0 | City |
| Seward | 9 | 234 | 242 | 0% | 1 | 215 | Township |
| Seward | 10 | 234 | 241 | 0% | 1 | 215 | Township |
Liberal is the largest city in Seward County, with a population of 19,045.
Seward is the smallest city in Seward County, with a population of 234.
There are 10 cities in Seward County, Kansas.