13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sharon Springs | 1 | 904 | 943 | -1.74% | 3 | 342 | Township |
| Sharon Springs | 2 | 904 | 943 | -1.74% | 3 | 342 | Township |
| Sharon Springs | 3 | 728 | 750 | -0.68% | 806 | 1 | City |
| Sharon Springs | 4 | 728 | 750 | -0.68% | 806 | 1 | City |
| Weskan | 5 | 317 | 331 | -1.55% | 1 | 302 | Township |
| Weskan | 6 | 317 | 331 | -1.55% | 1 | 302 | Township |
| Wallace | 7 | 154 | 166 | -3.75% | 1 | 188 | Township |
| Wallace | 8 | 154 | 166 | -3.75% | 1 | 188 | Township |
| Weskan | 9 | 113 | 103 | -3.42% | 43 | 3 | CDP |
| Harrison | 10 | 68 | 72 | -2.86% | 1 | 81 | Township |
| Harrison | 11 | 68 | 72 | -2.86% | 1 | 81 | Township |
| Wallace | 12 | 44 | 46 | -2.22% | 109 | 0 | City |
| Wallace | 13 | 44 | 46 | -2.22% | 109 | 0 | City |
Sharon Springs is the largest city in Wallace County, with a population of 904.
Wallace is the smallest city in Wallace County, with a population of 44.
There are 13 cities in Wallace County, Kansas.