31 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Madison | 1 | 9,403 | 9,399 | 0.83% | 67 | 141 | Township |
| Eureka | 2 | 2,236 | 2,298 | -0.58% | 976 | 2 | City |
| Madison | 3 | 959 | 990 | -0.83% | 8 | 124 | Township |
| Madison | 4 | 663 | 686 | -0.75% | 1,135 | 1 | City |
| Eureka | 5 | 616 | 630 | -0.16% | 17 | 36 | Township |
| Twin Grove | 6 | 403 | 409 | -0.49% | 7 | 57 | Township |
| Salt Springs | 7 | 377 | 383 | -0.53% | 5 | 71 | Township |
| Eureka | 8 | 359 | 364 | -0.55% | 6 | 58 | Township |
| Janesville | 9 | 342 | 348 | -0.29% | 2 | 144 | Township |
| Fall River | 10 | 326 | 330 | 0% | 6 | 50 | Township |
| Bachelor | 11 | 199 | 204 | -0.5% | 3 | 60 | Township |
| Severy | 12 | 196 | 199 | -0.51% | 400 | 0 | City |
| Fall River | 13 | 186 | 190 | -0.53% | 3 | 60 | Township |
| Hamilton | 14 | 178 | 181 | -0.56% | 571 | 0 | City |
| Otter Creek | 15 | 159 | 159 | 0.63% | 1 | 112 | Township |
| Shell Rock | 16 | 131 | 134 | -0.76% | 2 | 53 | Township |
| Fall River | 17 | 126 | 129 | -0.79% | 573 | 0 | City |
| Quincy | 18 | 122 | 125 | -0.81% | 2 | 60 | Township |
| Spring Creek | 19 | 116 | 119 | -0.85% | 2 | 54 | Township |
| Piedmont | 20 | 100 | 38 | 7.53% | 27 | 4 | CDP |
| South Salem | 21 | 94 | 95 | 0% | 1 | 87 | Township |
| Eureka | 22 | 85 | 87 | 0% | 2 | 36 | Township |
| Eureka | 23 | 83 | 91 | -3.49% | 2 | 36 | Township |
| Madison | 24 | 83 | 84 | 0% | 2 | 36 | Township |
| Lamont | 25 | 71 | 70 | 1.43% | 0.00 | 164 | Township |
| Pleasant Grove | 26 | 61 | 61 | 0% | 1 | 58 | Township |
| Virgil | 27 | 46 | 48 | -2.13% | 82 | 1 | City |
| Neal | 28 | 43 | 44 | 7.5% | 214 | 0 | CDP |
| Eureka | 29 | 33 | 34 | -2.94% | 1 | 37 | Township |
| Eureka | 30 | 21 | 21 | 0% | 1 | 36 | Township |
| Salem | 31 | 19 | 19 | 0% | 0.00 | 90 | Township |
Madison is the largest city in Greenwood County, with a population of 9,403.
Salem is the smallest city in Greenwood County, with a population of 19.
There are 31 cities in Greenwood County, Kansas.