San Juan County Demographics

A map of San Juan County's Population by Race

San Juan County, Washington has an estimated population of 18,478, an increase from the 17,788 recorded in the 2020 Census. The population is 85.2% White, 7.6% Hispanic, 4.6% Multiracial, 1.3% Asian, 1.0% Native American/Other, and 0.2% Black. This demographic dot map shows the population of San Juan County, with one dot drawn for each person counted by the Census, color-coded by race.

San Juan has become less racially diverse since the 2020 Census. It is considerably less diverse than Washington overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In San Juan County, that probability was 27.8% in 2020 and 26.6% in the most recent ACS estimates.

San Juan County is ranked the 32nd most populous county in Washington, out of 39 counties. San Juan County was ranked the 32nd most populous county in the 2020 Census.

San Juan County's White Population

15,743 residents of San Juan County, or 85.2% of the population, identify as White. The share of White residents in San Juan County is significantly higher than in Washington overall, where 63.1% of the population is White. San Juan County ranks 8th statewide in terms of White residents as a share of the population, out of 39 counties.

Since the 2020 Census, San Juan County's White population has grown by an estimated 4.8%. White residents' share of San Juan County's population has increased from 84.5% to 85.2%.

San Juan County is more White than neighboring Island County (75.4% White), Kitsap County (72.6% White), Jefferson County (84.6% White), Clallam County (80.2% White), and Whatcom County (75.7% White).

San Juan County's Black Population

45 residents of San Juan County, or 0.2% of the population, identify as Black. The share of Black residents in San Juan County is slightly lower than in Washington overall, where 3.8% of the population is Black. San Juan County ranks 35th statewide in terms of Black residents as a share of the population, out of 39 counties.

Since the 2020 Census, San Juan County's Black population has declined by an estimated 6.3%. Black residents' share of San Juan County's population has remained roughly unchanged at 0.2%.

San Juan County is less Black than neighboring Island County (2.2% Black), Kitsap County (2.2% Black), Jefferson County (0.3% Black), Clallam County (0.8% Black), and Whatcom County (0.9% Black).

San Juan County's Asian Population

248 residents of San Juan County, or 1.3% of the population, identify as Asian. The share of Asian residents in San Juan County is lower than in Washington overall, where 9.7% of the population is Asian. San Juan County ranks 21st statewide in terms of Asian residents as a share of the population, out of 39 counties.

Since the 2020 Census, San Juan County's Asian population has grown by an estimated 10.7%. Asian residents' share of San Juan County's population has remained roughly unchanged at 1.3%.

San Juan County is less Asian than neighboring Island County (4.9% Asian), Kitsap County (4.8% Asian), Clallam County (1.7% Asian), and Whatcom County (4.4% Asian).

San Juan County's Hispanic Population

1,409 residents of San Juan County, or 7.6% of the population, identify as Hispanic. The share of Hispanic residents in San Juan County is lower than in Washington overall, where 14.4% of the population is Hispanic. San Juan County ranks 28th statewide in terms of Hispanic residents as a share of the population, out of 39 counties.

Since the 2020 Census, San Juan County's Hispanic population has grown by an estimated 8.6%. Hispanic residents' share of San Juan County's population has remained roughly unchanged at 7.6%.

San Juan County is more Hispanic than neighboring Jefferson County (4.4% Hispanic), and Clallam County (6.8% Hispanic). San Juan County is less Hispanic than neighboring Island County (8.7% Hispanic), Kitsap County (9.4% Hispanic), and Whatcom County (10.6% Hispanic).

San Juan County's Native American/Other Population

186 residents of San Juan County, or 1.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in San Juan County is comparable to the share in Washington overall, where 2.1% of the population is Native American/Other. San Juan County ranks 34th statewide in terms of Native American/Other residents as a share of the population, out of 39 counties.

Since the 2020 Census, San Juan County's Native American/Other population has declined by an estimated 21.5%. Native American/Other residents' share of San Juan County's population has remained roughly unchanged at 1.0%.

San Juan County is less Native American/Other than neighboring Island County (1.3% Native American/Other), Kitsap County (2.4% Native American/Other), Jefferson County (2.8% Native American/Other), Clallam County (3.8% Native American/Other), and Whatcom County (2.2% Native American/Other).

San Juan County's Multiracial Population

847 residents of San Juan County, or 4.6% of the population, identify as Multiracial. The share of Multiracial residents in San Juan County is slightly lower than in Washington overall, where 6.8% of the population is Multiracial. San Juan County ranks 25th statewide in terms of Multiracial residents as a share of the population, out of 39 counties.

Since the 2020 Census, San Juan County's Multiracial population has declined by an estimated 11.5%. Multiracial residents' share of San Juan County's population has decreased from 5.4% to 4.6%.

San Juan County is less Multiracial than neighboring Island County (7.5% Multiracial), Kitsap County (8.6% Multiracial), Jefferson County (6.5% Multiracial), Clallam County (6.7% Multiracial), and Whatcom County (6.2% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.