26 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wayne | 1 | 29,687 | 29,277 | 0.13% | 695 | 43 | Township |
| Warsaw | 2 | 16,186 | 15,808 | 0.47% | 1,195 | 14 | City |
| Plain | 3 | 8,947 | 8,846 | 0.39% | 264 | 34 | Township |
| Turkey Creek | 4 | 8,661 | 8,635 | 0.31% | 302 | 29 | Township |
| Winona Lake | 5 | 5,119 | 5,059 | 0.23% | 1,735 | 3 | Town |
| Harrison | 6 | 3,726 | 3,723 | 0.27% | 89 | 42 | Township |
| Syracuse | 7 | 3,235 | 3,240 | -0.03% | 1,462 | 2 | Town |
| Milford | 8 | 2,985 | 2,918 | 0.44% | 88 | 34 | Township |
| Seward | 9 | 2,311 | 2,293 | 0.43% | 66 | 35 | Township |
| Jefferson | 10 | 1,922 | 1,927 | 0.26% | 61 | 31 | Township |
| Prairie | 11 | 1,780 | 1,770 | 0.34% | 51 | 35 | Township |
| Scott | 12 | 1,765 | 1,746 | 0.57% | 76 | 23 | Township |
| Milford | 13 | 1,684 | 1,683 | 0% | 1,160 | 1 | Town |
| Clay | 14 | 1,673 | 1,652 | 0.48% | 57 | 29 | Township |
| Lake | 15 | 1,540 | 1,537 | 0.26% | 67 | 23 | Township |
| Etna | 16 | 1,505 | 1,489 | 0.53% | 75 | 20 | Township |
| Jackson | 17 | 1,246 | 1,239 | 0.32% | 43 | 29 | Township |
| North Webster | 18 | 999 | 998 | 0% | 1,235 | 1 | Town |
| Pierceton | 19 | 930 | 932 | -0.11% | 745 | 1 | Town |
| Mentone | 20 | 919 | 947 | -0.65% | 1,576 | 1 | Town |
| Silver Lake | 21 | 873 | 870 | 0% | 1,611 | 1 | Town |
| Etna Green | 22 | 580 | 570 | 0.35% | 1,158 | 1 | Town |
| Leesburg | 23 | 549 | 551 | -0.18% | 2,145 | 0 | Town |
| Claypool | 24 | 394 | 397 | -0.25% | 1,615 | 0 | Town |
| Sidney | 25 | 128 | 133 | -0.78% | 1,016 | 0 | Town |
| Burket | 26 | 125 | 123 | 0% | 1,761 | 0 | Town |
Wayne is the largest city in Kosciusko County, with a population of 29,687.
Burket is the smallest city in Kosciusko County, with a population of 125.
There are 26 cities in Kosciusko County, Indiana.