| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Blanding | 1 | 3,153 | 3,386 | -1.44% | 239 | 13 | City |
| Monticello | 2 | 1,715 | 1,826 | -1.27% | 512 | 3 | City |
| Bluff | 3 | 253 | 244 | 0.4% | 7.0 | 37 | Town |
Blanding is the largest city in San Juan County, with a population of 3,153.
Bluff is the smallest city in San Juan County, with a population of 253.
There are 3 cities in San Juan County, Utah.