3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Blanding | 1 | 3,174 | 3,383 | -1.31% | 241 | 13 | City |
| Monticello | 2 | 1,739 | 1,827 | -1.02% | 519 | 3 | City |
| Bluff | 3 | 252 | 242 | 0.8% | 7 | 37 | Town |
Blanding is the largest city in San Juan County, with a population of 3,174.
Bluff is the smallest city in San Juan County, with a population of 252.
There are 3 cities in San Juan County, Utah.