8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| WaKeeney | 1 | 2,096 | 2,100 | 0.53% | 12 | 180 | Township |
| WaKeeney | 2 | 1,755 | 1,788 | -0.28% | 984 | 2 | City |
| Collyer | 3 | 290 | 293 | 0.35% | 1 | 200 | Township |
| Ogallah | 4 | 169 | 162 | 1.2% | 1 | 144 | Township |
| Collyer | 5 | 93 | 95 | 0% | 397 | 0 | City |
| Riverside | 6 | 88 | 87 | 1.15% | 1 | 115 | Township |
| Glencoe | 7 | 67 | 68 | 0% | 2 | 36 | Township |
| Wilcox | 8 | 66 | 64 | 1.54% | 1 | 115 | Township |
WaKeeney is the largest city in Trego County, with a population of 2,096.
Wilcox is the smallest city in Trego County, with a population of 66.
There are 8 cities in Trego County, Kansas.