3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Blanding | 1 | 3,132 | 3,383 | -1.32% | 238 | 13 | City |
| Monticello | 2 | 1,722 | 1,827 | -0.98% | 514 | 3 | City |
| Bluff | 3 | 254 | 242 | 0.79% | 7 | 37 | Town |
Blanding is the largest city in San Juan County, with a population of 3,132.
Bluff is the smallest city in San Juan County, with a population of 254.
There are 3 cities in San Juan County, Utah.