| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hebron | 1 | 1,369 | 1,452 | -1.08% | 928 | 1 | City |
| Deshler | 2 | 738 | 748 | -0.14% | 1,453 | 1 | City |
| Davenport | 3 | 304 | 318 | -0.98% | 466 | 1 | Village |
| Bruning | 4 | 279 | 292 | -1.06% | 861 | 0 | Village |
| Chester | 5 | 210 | 221 | -0.94% | 358 | 1 | Village |
| Alexandria | 6 | 139 | 145 | -0.71% | 344 | 0 | Village |
| Carleton | 7 | 89 | 94 | -1.11% | 112 | 1 | Village |
| Byron | 8 | 85 | 90 | -1.16% | 545 | 0 | Village |
| Hubbell | 9 | 65 | 69 | -1.52% | 208 | 0 | Village |
| Reynolds | 10 | 61 | 62 | -1.61% | 243 | 0 | Village |
| Belvidere | 11 | 53 | 56 | -1.85% | 114 | 0 | Village |
| Gilead | 12 | 29 | 31 | -3.33% | 420 | 0 | Village |
Hebron is the largest city in Thayer County, with a population of 1,369.
Gilead is the smallest city in Thayer County, with a population of 29.
There are 12 cities in Thayer County, Nebraska.