| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Belleville | 1 | 1,981 | 1,995 | -0.25% | 964 | 2 | City |
| Scandia | 2 | 338 | 344 | -0.59% | 718 | 0 | City |
| Courtland | 3 | 290 | 293 | -0.34% | 1,078 | 0 | City |
| Cuba | 4 | 136 | 139 | -0.73% | 472 | 0 | City |
| Munden | 5 | 98 | 98 | 0% | 527 | 0 | City |
| Narka | 6 | 81 | 84 | -1.22% | 506 | 0 | City |
| Republic | 7 | 79 | 82 | -1.25% | 339 | 0 | City |
| Agenda | 8 | 45 | 47 | -2.17% | 260 | 0 | City |
Belleville is the largest city in Republic County, with a population of 1,981.
Agenda is the smallest city in Republic County, with a population of 45.
There are 8 cities in Republic County, Kansas.