San Juan County, Washington
San Juan County: county in the state of Washington, United States
About
San Juan County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 15,769 and a population density of 10 people per km². After 10 years in 2020 county had an estimated population of 17,492 inhabitants. Its county seat is Friday Harbor. The county was created 153 years ago in 1872.
County Snapshot
San Juan County at a glance
San Juan County currently has 1 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
1
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
Washington counties
39
Open related pagesLargest city
Friday HarborPopulation 2,544
Top linked places
Quick Facts about San Juan County
| Population | 17,492 (2020) |
| Country | United States of America |
| State | Washington (United States) |
| Different from | San Juan County, San Juan County, San Juan County, San Juan |
| Area | 1609 km2 |
| Water as percent of area | 72% |
| Land as percent of area | 28% |
| Latitude & Longitude | 48.5312,-123.0249 |
| Named for | San Juan Islands |
| Capital | Friday Harbor |
| Establishment | January 01, 1873 |
| Time Zone | America/Los_Angeles |
| Local time | 11:42:51 (17th April 2026) |
| Density | 11 Pop. per km² as of 2020 |
| Population growth | 9.85% (2010-2020) |
| Weather | 41℉ Partly Cloudy 7-days weather |
Geography
San Juan County is located at 48°31'52"N 123°1'30"W (48.5311600, -123.0249000). It has 5 neighbors: Clallam County, Island County, Jefferson County, Skagit County and Whatcom County.
San Juan County map
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The largest city of San Juan County is Friday Harbor with a population of 2,544. . See all San Juan County cities & populated places.
San Juan County Populated Places
Cities, towns, neighborhoods & other populated places in San Juan County.
| City Name | Population | Title |
|---|---|---|
| Friday Harbor | 2,544 | Town in San Juan County, Washington, United States |
Weather
Partly cloudy, with a low around 41. West southwest wind around 5 mph.
7-Day ForecastOfficial website of San Juan County
Official Website- Friday Harbor
Demographics
The population of San Juan County increased by 9.85% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 15,769 | - | census |
| 2011 | 15,845 | 0.48% | estimation process |
| 2012 | 15,848 | 0.02% | estimation process |
| 2013 | 15,909 | 0.38% | estimation process |
| 2014 | 16,009 | 0.62% | estimation process |
| 2015 | 16,198 | 1.17% | estimation process |
| 2016 | 16,309 | 0.68% | estimation process |
| 2017 | 16,729 | 2.51% | estimation process |
| 2018 | 17,124 | 2.31% | estimation process |
| 2019 | 17,582 | 2.6% | estimation process |
| 2020 | 17,492 | -0.51% | estimation process |
Other places with the same name (3)
- San Juan County, New Mexico county in southeastern Utah, United States with a population of 123,312 people.
- San Juan County, Utah county in southeastern Utah, United States with a population of 15,278 people.
- San Juan County, Colorado county in Colorado, United States with a population of 748 people.
Washington Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| King County | 2,274,315 | County in the state of Washington, United States |
| Pierce County | 913,890 | County in the state of Washington, United States |
| Snohomish County | 830,393 | County in the state of Washington, United States |
| Seattle | 769,714 | The eighteenth most populous city in the United States and the center of the Seattle metropolitan area. |
| Spokane County | 528,225 | County in the state of Washington, United States |
| Clark County | 496,865 | County in Washington, United States |
| Thurston County | 294,074 | County in the state of Washington, United States |
| Kitsap County | 272,787 | County in the state of Washington, United States |
| Yakima County | 251,879 | County in the state of Washington, United States |
| Whatcom County | 231,016 | County in the state of Washington, United States |
| Spokane | 222,050 | The second most populous city in Washington. |
| Tacoma | 219,945 | The third most populous city in Washington. |
| Benton County | 206,426 | County in Arkansas, United States |
| Vancouver | 186,192 | The third most populous city in Washington. |
| Bellevue | 148,073 | The most populous city in Washington. |
| Skagit County | 130,789 | County in the state of Washington, United States |