Washington County Demographics

A map of Washington County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	362,515	365,232	60.0%	60.8%
Hispanic	112,182	107,642	18.6%	17.9%
Asian	68,747	68,430	11.4%	11.4%
Multiracial	39,442	37,553	6.5%	6.3%
Black	13,165	12,763	2.2%	2.1%
Native American/Other	7,896	8,752	1.3%	1.5%

Washington County, Oregon has an estimated population of 603,947, a less than 1% change from the 600,372 recorded in the 2020 Census. The population is 60.0% White, 18.6% Hispanic, 11.4% Asian, 6.5% Multiracial, 2.2% Black, and 1.3% Native American/Other. This demographic dot map shows the population of Washington County, with one dot drawn for each person counted by the Census, color-coded by race.

Washington has become slightly more racially diverse since the 2020 Census. It is considerably more diverse than Oregon overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Washington County, that probability was 58.0% in 2020 and 58.7% in the most recent ACS estimates.

Washington County is ranked the 2nd most populous county in Oregon, out of 36 counties. Washington County was ranked the 2nd most populous county in the 2020 Census.

Washington County's White Population

362,515 residents of Washington County, or 60.0% of the population, identify as White. The share of White residents in Washington County is considerably lower than in Oregon overall, where 71.4% of the population is White. Washington County ranks 34th statewide in terms of White residents as a share of the population, out of 36 counties.

Since the 2020 Census, Washington County's White population has remained roughly the same. White residents' share of Washington County's population has decreased from 60.8% to 60.0%.

Washington County is less White than neighboring Columbia County (84.3% White), Yamhill County (72.7% White), Clark County (72.5% White), Tillamook County (81.3% White), and Multnomah County (65.2% White).

Washington County's Black Population

13,165 residents of Washington County, or 2.2% of the population, identify as Black. The share of Black residents in Washington County is comparable to the share in Oregon overall, where 1.8% of the population is Black. Washington County ranks 2nd statewide in terms of Black residents as a share of the population, out of 36 counties.

Since the 2020 Census, Washington County's Black population has grown by an estimated 3.1%. Black residents' share of Washington County's population has remained roughly unchanged at 2.2%.

Washington County is more Black than neighboring Columbia County (0.6% Black), Yamhill County (0.7% Black), Clark County (2.1% Black), and Tillamook County (0.8% Black). Washington County is less Black than neighboring Multnomah County (5.3% Black).

Washington County's Asian Population

68,747 residents of Washington County, or 11.4% of the population, identify as Asian. The share of Asian residents in Washington County is higher than in Oregon overall, where 4.4% of the population is Asian. Washington County ranks 1st statewide in terms of Asian residents as a share of the population, out of 36 counties.

Since the 2020 Census, Washington County's Asian population has remained roughly the same. Asian residents' share of Washington County's population has remained roughly unchanged at 11.4%.

Washington County is more Asian than neighboring Columbia County (0.8% Asian), Yamhill County (1.9% Asian), Clark County (5% Asian), Tillamook County (0.8% Asian), and Multnomah County (7.4% Asian).

Washington County's Hispanic Population

112,182 residents of Washington County, or 18.6% of the population, identify as Hispanic. The share of Hispanic residents in Washington County is slightly higher than in Oregon overall, where 14.7% of the population is Hispanic. Washington County ranks 8th statewide in terms of Hispanic residents as a share of the population, out of 36 counties.

Since the 2020 Census, Washington County's Hispanic population has grown by an estimated 4.2%. Hispanic residents' share of Washington County's population has increased from 17.9% to 18.6%.

Washington County is more Hispanic than neighboring Columbia County (6.7% Hispanic), Yamhill County (17.6% Hispanic), Clark County (12.3% Hispanic), Tillamook County (11.4% Hispanic), and Multnomah County (13.5% Hispanic).

Washington County's Native American/Other Population

7,896 residents of Washington County, or 1.3% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Washington County is comparable to the share in Oregon overall, where 1.6% of the population is Native American/Other. Washington County ranks 27th statewide in terms of Native American/Other residents as a share of the population, out of 36 counties.

Since the 2020 Census, Washington County's Native American/Other population has declined by an estimated 9.8%. Native American/Other residents' share of Washington County's population has remained roughly unchanged at 1.3%.

Washington County is more Native American/Other than neighboring Tillamook County (0.8% Native American/Other). Washington County is less Native American/Other than neighboring Columbia County (1.5% Native American/Other), Yamhill County (1.6% Native American/Other), Clark County (1.7% Native American/Other), and Multnomah County (1.6% Native American/Other).

Washington County's Multiracial Population

39,442 residents of Washington County, or 6.5% of the population, identify as Multiracial. The share of Multiracial residents in Washington County is comparable to the share in Oregon overall, where 6.1% of the population is Multiracial. Washington County ranks 10th statewide in terms of Multiracial residents as a share of the population, out of 36 counties.

Since the 2020 Census, Washington County's Multiracial population has grown by an estimated 5.0%. Multiracial residents' share of Washington County's population has remained roughly unchanged at 6.5%.

Washington County is more Multiracial than neighboring Columbia County (6% Multiracial), Yamhill County (5.4% Multiracial), Clark County (6.4% Multiracial), and Tillamook County (5% Multiracial). Washington County is less Multiracial than neighboring Multnomah County (7.1% 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.