20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Topeka | 1 | 124,833 | 126,437 | -0.26% | 2,025 | 61.66 | City |
| Tecumseh township | 2 | 7,821 | 7,749 | 0.45% | 235 | 33.30 | Township |
| Williamsport township | 3 | 4,332 | 4,290 | 0.46% | 109 | 39.57 | Township |
| Auburn township | 4 | 3,329 | 3,301 | 0.48% | 61 | 54.74 | Township |
| Monmouth township | 5 | 3,217 | 3,180 | 0.5% | 57 | 56.42 | Township |
| Wakarusa township | 6 | 2,183 | 2,087 | 0.92% | 53 | 41.57 | Township |
| Silver Lake township | 7 | 1,888 | 1,915 | 0% | 106 | 17.80 | Township |
| Rossville township | 8 | 1,885 | 1,906 | 0% | 37 | 50.78 | Township |
| Lecompton township | 9 | 1,699 | 1,643 | 0.71% | 49 | 34.87 | Township |
| Dover township | 10 | 1,699 | 1,686 | 0.41% | 30 | 55.71 | Township |
| Menoken township | 11 | 1,642 | 1,629 | 0.43% | 37 | 44.41 | Township |
| Silver Lake | 12 | 1,296 | 1,343 | -0.69% | 2,302 | 0.56 | City |
| Auburn | 13 | 1,257 | 1,267 | -0.16% | 1,806 | 0.70 | City |
| Rossville | 14 | 1,076 | 1,110 | -0.65% | 1,942 | 0.55 | City |
| Grove township | 15 | 757 | 740 | 0.8% | 25 | 29.71 | Township |
| Topeka township | 16 | 732 | 721 | 0.55% | 78 | 9.41 | Township |
| Lecompton | 17 | 597 | 592 | 0.17% | 340 | 1.76 | City |
| Tecumseh | 18 | 402 | 369 | 6.91% | 113 | 3.57 | CDP |
| Wakarusa | 19 | 239 | 223 | -0.42% | 48 | 4.96 | CDP |
| Willard | 20 | 75 | 74 | 0% | 688 | 0.11 | City |
Topeka is the largest city in Shawnee County, with a population of 124,833.
Willard is the smallest city in Shawnee County.
There are 20 cities in Shawnee County, Kansas.