29 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Madison | 1 | 9,480 | 9,399 | 0.82% | 67 | 141 | Township |
| Eureka | 2 | 2,224 | 2,298 | -0.54% | 971 | 2 | City |
| Madison | 3 | 951 | 990 | -0.83% | 8 | 124 | Township |
| Madison | 4 | 659 | 686 | -0.6% | 1,128 | 1 | City |
| Eureka | 5 | 615 | 630 | -0.16% | 17 | 36 | Township |
| Twin Grove | 6 | 401 | 409 | -0.5% | 7 | 57 | Township |
| Salt Springs | 7 | 375 | 383 | -0.53% | 5 | 71 | Township |
| Eureka | 8 | 357 | 364 | -0.56% | 6 | 58 | Township |
| Janesville | 9 | 341 | 348 | -0.29% | 2 | 144 | Township |
| Fall River | 10 | 326 | 330 | 0% | 6 | 50 | Township |
| Bachelor | 11 | 198 | 204 | -0.5% | 3 | 60 | Township |
| Severy | 12 | 196 | 199 | 0% | 400 | 0 | City |
| Fall River | 13 | 185 | 190 | -0.54% | 3 | 60 | Township |
| Hamilton | 14 | 178 | 181 | 0% | 571 | 0 | City |
| Otter Creek | 15 | 160 | 159 | 0.63% | 1 | 112 | Township |
| Shell Rock | 16 | 130 | 134 | -0.76% | 2 | 53 | Township |
| Fall River | 17 | 126 | 129 | 0% | 573 | 0 | City |
| Quincy | 18 | 121 | 125 | -0.82% | 2 | 60 | Township |
| Spring Creek | 19 | 115 | 119 | -0.86% | 2 | 54 | Township |
| South Salem | 20 | 94 | 95 | 0% | 1 | 87 | Township |
| Eureka | 21 | 85 | 87 | 0% | 2 | 36 | Township |
| Madison | 22 | 83 | 84 | 0% | 2 | 36 | Township |
| Eureka | 23 | 80 | 91 | -3.61% | 2 | 36 | Township |
| Lamont | 24 | 72 | 70 | 1.41% | 0.00 | 164 | Township |
| Pleasant Grove | 25 | 61 | 61 | 0% | 1 | 58 | Township |
| Virgil | 26 | 46 | 48 | 0% | 82 | 1 | City |
| Eureka | 27 | 32 | 34 | -3.03% | 1 | 37 | Township |
| Eureka | 28 | 21 | 21 | 0% | 1 | 36 | Township |
| Salem | 29 | 19 | 19 | 0% | 0.00 | 90 | Township |
Madison is the largest city in Greenwood County, with a population of 9,480.
Salem is the smallest city in Greenwood County, with a population of 19.
There are 29 cities in Greenwood County, Kansas.