| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Broken Bow | 1 | 3,504 | 3,521 | -0.09% | 1,735 | 2 | City |
| Arnold | 2 | 591 | 589 | 0% | 882 | 1 | Village |
| Callaway | 3 | 562 | 559 | 0.18% | 805 | 1 | Village |
| Sargent | 4 | 478 | 492 | -0.42% | 441 | 1 | City |
| Ansley | 5 | 455 | 459 | -0.22% | 713 | 1 | Village |
| Merna | 6 | 344 | 343 | 0% | 642 | 1 | Village |
| Mason City | 7 | 149 | 147 | 0% | 314 | 0 | Village |
| Oconto | 8 | 141 | 141 | 0% | 695 | 0 | Village |
| Anselmo | 9 | 105 | 107 | -0.94% | 395 | 0 | Village |
| Berwyn | 10 | 73 | 73 | 0% | 286 | 0 | Village |
| Comstock | 11 | 73 | 73 | 0% | 209 | 0 | Village |
Broken Bow is the largest city in Custer County, with a population of 3,504.
Comstock is the smallest city in Custer County, with a population of 73.
There are 11 cities in Custer County, Nebraska.