11 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sutton | 1 | 1,439 | 1,451 | -0.14% | 776 | 2 | City |
| Harvard | 2 | 939 | 947 | -0.11% | 1,456 | 1 | City |
| Clay Center | 3 | 723 | 722 | 0% | 989 | 1 | City |
| Edgar | 4 | 427 | 426 | 0% | 541 | 1 | City |
| Fairfield | 5 | 333 | 333 | 0% | 463 | 1 | City |
| Glenvil | 6 | 269 | 266 | 0.37% | 1,555 | 0 | Village |
| Trumbull | 7 | 198 | 197 | 0% | 459 | 0 | Village |
| Ong | 8 | 51 | 50 | 0% | 178 | 0 | Village |
| Deweese | 9 | 44 | 44 | 0% | 349 | 0 | Village |
| Saronville | 10 | 37 | 37 | 0% | 248 | 0 | Village |
| Stockham | 11 | 34 | 33 | 0% | 201 | 0 | Village |
Sutton is the largest city in Clay County, with a population of 1,439.
Stockham is the smallest city in Clay County, with a population of 34.
There are 11 cities in Clay County, Nebraska.