27 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sutton | 1 | 1,454 | 1,451 | 0.07% | 841 | 1.73 | City |
| Harvard township | 2 | 1,122 | 1,091 | 1.45% | 32 | 35.54 | Township |
| Harvard | 3 | 943 | 948 | -0.11% | 1,462 | 0.65 | City |
| Clay Center | 4 | 730 | 725 | 0.14% | 999 | 0.73 | City |
| Fairfield township | 5 | 528 | 515 | 0.96% | 15 | 36.09 | Township |
| Edgar township | 6 | 507 | 498 | 0.8% | 14 | 35.85 | Township |
| Edgar | 7 | 427 | 426 | 0% | 541 | 0.79 | City |
| Glenvil township | 8 | 404 | 390 | 1.25% | 11 | 35.69 | Township |
| Fairfield | 9 | 333 | 332 | 0% | 463 | 0.72 | City |
| Leicester township | 10 | 321 | 309 | 1.58% | 9 | 35.53 | Township |
| Glenvil | 11 | 269 | 266 | 0.37% | 1,555 | 0.17 | Village |
| Trumbull | 12 | 198 | 195 | 0.51% | 459 | 0.43 | Village |
| Spring Ranch township | 13 | 159 | 151 | 1.92% | 4 | 35.64 | Township |
| School Creek township | 14 | 143 | 141 | 0.7% | 4 | 35.34 | Township |
| Lewis township | 15 | 127 | 125 | 0.79% | 4 | 35.55 | Township |
| Sutton township | 16 | 120 | 118 | 0.84% | 3 | 34.45 | Township |
| Logan township | 17 | 110 | 106 | 1.85% | 3 | 36.07 | Township |
| Inland township | 18 | 100 | 98 | 1.01% | 3 | 35.70 | Township |
| Eldorado township | 19 | 98 | 96 | 1.03% | 3 | 35.67 | Township |
| Lone Tree township | 20 | 92 | 90 | 1.1% | 3 | 35.41 | Township |
| Sheridan township | 21 | 79 | 77 | 1.28% | 2 | 35.99 | Township |
| Lynn township | 22 | 69 | 67 | 1.47% | 2 | 35.47 | Township |
| Marshall township | 23 | 54 | 52 | 1.89% | 2 | 35.85 | Township |
| Ong | 24 | 49 | 49 | 0% | 171 | 0.29 | Village |
| Deweese | 25 | 42 | 42 | 0% | 333 | 0.13 | Village |
| Saronville | 26 | 37 | 37 | 0% | 248 | 0.15 | Village |
| Stockham | 27 | 33 | 33 | 0% | 195 | 0.17 | Village |
Sutton is the largest city in Clay County, with a population of 1,454.
Stockham is the smallest city in Clay County.
There are 27 cities in Clay County, Nebraska.