Washington County, Oregon Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 2nd-largest in Oregon
The population of Washington County, Oregon is 600,266 as of the 2023 American Community Survey, making it the 2nd-largest county in Oregon. The median household income is $104,434, the median home value is $558,500, and the median age is 37.8.
The population of Washington County has grown 15.0% since 2010 (531,652 → 611,272), a +1.00% annualized rate.
600,266
Population
+1.00%
Annual growth
829
People / sq mi
$104,434
Median Income
$558,500
Median Home Value
Washington County covers 724 sq mi of land at 828.8 people per square mile.
About Washington County, OR
Remote work is unusually prominent in Washington County: 21.7% of workers primarily work from home, above the 14.0% national rate. With 600,266 residents, Washington County is a county in Oregon. That makes it one of the ten largest counties in Oregon in the country, at #2 by population.
Income is a real outlier — the median household pulls in $104,434, putting Washington County near the top of US counties. Only 5.0% of residents live in poverty, below the national 12.4%. Real estate commands a premium here — a median home value of $558,500, with typical rent around $1,773.
The population is unusually well-credentialed for US counties — 46.7% of adults have a four-year degree, above the national 35.0%. An unusually large 21.7% of workers are remote, above the national 14.0%, and the average commute runs about 24 minutes each way.
The remote-work concentration is telling in Washington County — it skews toward higher-income, college-educated workers and reshapes both commute patterns and housing demand.
Washington County Population History (2010-2024)
The county of Washington County had a population of 531,652 in 2010 and 611,272 in 2024, a 15.0% growth over 14 years. The peak was 611,272 in 2024. Average annual growth rate: 1.00%.
611,272
Population (2024)
531,652
Population (2010)
611,272
Peak (2024)
1.00%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 531,652 |
| 2011 | 541,041 |
| 2012 | 548,651 |
| 2013 | 555,443 |
| 2014 | 562,552 |
| 2015 | 572,955 |
| 2016 | 585,358 |
| 2017 | 591,969 |
| 2018 | 597,030 |
| 2019 | 600,933 |
| 2020 | 601,045 |
| 2021 | 602,356 |
| 2022 | 600,229 |
| 2023 | 604,831 |
| 2024 | 611,272 |
Race & Ethnicity
| White | 66.0% |
| Black or African American | 2.3% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.6% |
| Two or More Races | 0.2% |
Age & Sex
37.8
Median Age
50.1%
Female
49.9%
Male
14.3%
Age 65+
Age Distribution
Children (under 15): 18.0% · Seniors (65+): 14.3%
Income & Poverty
| Median household income | $104,434+$24,008 vs state |
| Mean household income | $133,965 |
| Per-capita income | $52,136 |
| Poverty rate | 5.0%-2.3% vs state |
| Unemployment rate | 3.1% |
| Employment-to-population | 65.5% |
Top Industries by Employment
The largest employment sector in Washington County is professional & business services, accounting for 19.9% of workers.
How residents commute
3.6%
Drive alone
2.3%
Carpool
63.4%
Public transit
21.7%
Work from home
24.1 min
Avg commute
Housing
$558,500+$104,300 vs state
Median home value
$1,773
Median rent
60.9%
Homeownership rate
240,409
Total housing units
96.7%
Occupied
3.3%
Vacant
39.1%
Renter-occupied
Social & access
94.6%
With health insurance
97.9%
With broadband internet
39.4%
Foreign-born
5.7%
Veterans (18+)
11.0%
With a disability
74.9%
Speak language other than English at home
Education
92.9%
High School+
46.7%
Bachelor's+
Largest cities in Oregon
Other counties in Oregon
Part of Oregon
Metro areas in Oregon
County rankings
Common questions about Washington County, OR
Frequently Asked Questions
Washington County, Oregon has a population of 600,266 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 2nd-largest county in Oregon. Population density is 829 people per square mile.
The population of Washington County has grown 15.0% since 2010 (531,652 → 611,272), a +1.00% annualized rate.
The median household income in Washington County, Oregon is $104,434, with mean (average) household income of $133,965 and per-capita income of $52,136. 5.0% of residents live below the federal poverty level.
In Washington County, the largest racial and ethnic groups are White (66.0%), Hispanic or Latino (2.6%), Black or African American (2.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Washington County, Oregon is 37.8 years. Residents are 50.1% female and 49.9% male.
The median home value in Washington County is $558,500 and median monthly rent is $1,773. 60.9% of occupied housing units are owner-occupied. The county has 240,409 total housing units, 3.3% of which are vacant.
The largest employment sector in Washington County, Oregon is professional, scientific, and management services, employing 19.9% of workers. The unemployment rate is 3.1%.
Portland is among the largest cities associated with Washington County, Oregon, with a population of 642,715.
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Statewide data for Oregon
Population, race, income, age, and trends across Oregon
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.