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
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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.
Washington County, OR Climate
Washington County, OR has an average annual temperature of 11°C (52°F) and receives about 1217 mm of precipitation per year. The warmest month is August and the coldest is December. Figures are 1970–2000 climate normals.
11°C
Avg Temp
1217
Precip (mm/yr)
Aug
Hottest Month
Dec
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 4° / 39° | 193 mm |
| February | 6° / 43° | 159 mm |
| March | 8° / 46° | 128 mm |
| April | 10° / 50° | 78 mm |
| May | 13° / 55° | 53 mm |
| June | 16° / 60° | 38 mm |
| July | 19° / 65° | 15 mm |
| August | 19° / 65° | 20 mm |
| September | 16° / 61° | 43 mm |
| October | 11° / 53° | 87 mm |
| November | 7° / 44° | 192 mm |
| December | 4° / 39° | 211 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Washington County, OR
The most comfortable months to visit Washington County, OR are typically July, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 27°C high). The coldest is December (near 1°C low). December is usually the wettest month.
Where to stay near Washington County
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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.