San Juan County, Washington Cities (2025)

2 cities

City
Rank
2025 Pop.
2020 Pop.
Change
Density
Area (mi²)
Type
Friday Harbor12,8062,6311.26%1,2832.19 Town
Roche Harbor29416157.18%2344.02 CDP

San Juan County Cities Summary

Largest City

Friday Harbor is the largest city in San Juan County, with a population of 2,806.

Smallest City

Roche Harbor is the smallest city in San Juan County.

10 Largest Cities

There are 2 cities in San Juan County, Washington.

Location of San Juan County