40 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hutchinson | 1 | 39,339 | 40,005 | -0.28% | 1,547 | 25 | City |
| Reno | 2 | 4,362 | 4,356 | 0.21% | 124 | 35 | Township |
| South Hutchinson | 3 | 2,496 | 2,525 | -0.2% | 878 | 3 | City |
| Clay | 4 | 1,985 | 1,970 | 0.35% | 66 | 30 | Township |
| Medora | 5 | 1,673 | 1,659 | 0.3% | 56 | 30 | Township |
| Haven | 6 | 1,569 | 1,555 | 0.32% | 28 | 55 | Township |
| Grant | 7 | 1,327 | 1,311 | 0.38% | 30 | 44 | Township |
| Buhler | 8 | 1,310 | 1,324 | -0.15% | 1,830 | 1 | City |
| Haven | 9 | 1,168 | 1,167 | 0% | 1,503 | 1 | City |
| Nickerson | 10 | 1,046 | 1,064 | -0.29% | 808 | 1 | City |
| Valley | 11 | 851 | 843 | 0.24% | 15 | 55 | Township |
| Albion | 12 | 827 | 843 | -0.36% | 22 | 38 | Township |
| Yoder | 13 | 802 | 804 | 0% | 22 | 37 | Township |
| Sumner | 14 | 681 | 676 | 0.44% | 17 | 41 | Township |
| Pretty Prairie | 15 | 647 | 659 | -0.31% | 1,123 | 1 | City |
| Center | 16 | 588 | 583 | 0.34% | 16 | 36 | Township |
| Arlington | 17 | 568 | 575 | 0% | 16 | 36 | Township |
| Salt Creek | 18 | 448 | 449 | 0% | 8 | 54 | Township |
| Arlington | 19 | 423 | 435 | -0.47% | 343 | 1 | City |
| Miami | 20 | 371 | 373 | 0% | 10 | 38 | Township |
| The Highlands | 21 | 348 | 350 | 0% | 340 | 1 | City |
| Castleton | 22 | 315 | 315 | 0% | 6 | 54 | Township |
| Turon | 23 | 305 | 307 | 0% | 685 | 0 | City |
| Sylvia | 24 | 291 | 285 | 0.69% | 8 | 36 | Township |
| Ninnescah | 25 | 230 | 222 | 0.88% | 8 | 30 | Township |
| Partridge | 26 | 212 | 209 | 0.47% | 684 | 0 | City |
| Sylvia | 27 | 212 | 212 | 0% | 734 | 0 | City |
| Plevna | 28 | 200 | 200 | 0% | 6 | 36 | Township |
| Westminster | 29 | 186 | 188 | 0% | 5 | 36 | Township |
| Medford | 30 | 153 | 154 | 0% | 5 | 32 | Township |
| Langdon | 31 | 128 | 121 | 1.59% | 4 | 36 | Township |
| Roscoe | 32 | 118 | 117 | 0% | 3 | 38 | Township |
| Huntsville | 33 | 117 | 118 | 0% | 3 | 36 | Township |
| Loda | 34 | 91 | 92 | 0% | 2 | 38 | Township |
| Plevna | 35 | 83 | 85 | 0% | 369 | 0 | City |
| Abbyville | 36 | 80 | 82 | 0% | 299 | 0 | City |
| Bell | 37 | 71 | 72 | 0% | 2 | 38 | Township |
| Willowbrook | 38 | 69 | 71 | 0% | 234 | 0 | City |
| Hayes | 39 | 58 | 58 | 0% | 1 | 72 | Township |
| Grove | 40 | 43 | 43 | 0% | 1 | 36 | Township |
Hutchinson is the largest city in Reno County, with a population of 39,339.
Grove is the smallest city in Reno County, with a population of 43.
There are 40 cities in Reno County, Kansas.