- county
- FIPS 41067
- Largest town: Hillsboro
Washington County, Oregon
Washington County had 611,272 residents in the Census Vintage 2024 estimate, on 724.3 square miles of land. It ranks 2nd of 36 in Oregon by population and 31st by land area.
- Population
- 611,272
- #2 of 36 in Oregon · #114 in US
- Area
- 724.3 sq mi
- #31 of 36 in Oregon · #1,227 in US
- Density
- 844 / sq mi
- #2 of 36 in Oregon · #184 in US
- Median household income
- $103,486
- #1 of 36 in Oregon · #104 in US
Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area
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Washington County population, land area and income
Washington County had 611,272 residents in the Census Vintage 2024 estimate, on 724.3 square miles of land. It ranks 2nd of 36 in Oregon by population and 31st by land area. That works out to 844.0 people per square mile, 8.8 times the US average of 96.3, and in the top tenth nationally.
The median county-equivalent in Oregon has 46,128 residents, so Washington County is 13.3 times that size.
Its SAIPE 2023 median household income of $103,486 is in the top tenth among 3,143 counties with an estimate.
National rank among 3,144
Population
611,272
114th of 3,144 (US)
Land area
724 sq mi
1227th of 3,144 (US)
Density
844.0 / sq mi
184th of 3,144 (US)
Median household income
$103,486
104th of 3,143 (US)
Rank within Oregon (36)
Population
611,272
2nd of 36 (OR)
Land area
724 sq mi
31st of 36 (OR)
Density
844.0 / sq mi
2nd of 36 (OR)
Median household income
$103,486
1st of 36 (OR)
How Washington County's population changed since 2020
Washington County gained 10,227 residents between the July 2020 and July 2024 estimates, a rise of 1.7%. That ranks 12th of 36 in Oregon for growth. The median Oregon county changed by +0.8%, and the state as a whole by +0.7%.
Since the April 2020 estimates base, Washington County recorded 25,567 births and 17,542 deaths, a natural change of +8,025. Net international migration added +17,651 and net domestic migration, people moving to or from other US counties, came to -15,416. The largest single component was international migration, which added 17,651 people.
Components of change, April 2020 to July 2024
- Births
- 25,567
- Deaths
- 17,542
- Net international migration
- +17,651
- Net domestic migration
- -15,416
- Change, July 2023 to July 2024
- +6,441
Where Washington County is
The Census internal point of Washington County is at 45.553500, -123.097600. It sits in UTM zone 10N. The map shades Oregon's 36 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Washington County outlined. Dots are towns of 1,000+ people with residents in it.
- < -0.7%
- < +0.1%
- < +1.2%
- < +2.7%
- ≥ +2.7%
Orange pin: Washington County internal point. Dark pin: Salem.
Internal point
- Decimal
- 45.553500, -123.097600
- DMS
- 45°33'12.60"N 123°05'51.36"W
- UTM
- 10N 492382.0E 5044444.9N
- Geohash
- c207nug06
- Plus code
- 84QRHW32+CX
Towns in Washington County
14 incorporated places of 1,000+ people have residents in Washington County, 370,849 people together, or 61% of the county. Each figure counts only the part of the town inside Washington County; towns marked "part" extend into another county. The largest is Hillsboro with 110,337.
- 01Hillsboro110,337
- 02Beaverton98,302
- 03Tigard57,301
- 04Forest Grove27,076
- 05Tualatin (part)24,875
- 06Sherwood20,441
- 07Cornelius15,369
- 08King City5,002
- 09North Plains3,424
- 10Wilsonville (part)3,364
- 11Durham1,880
- 12Banks1,831
- 13Portland (part)1,645
- 14Lake Oswego (part)2
Counties bordering Washington County
The Census 2024 county adjacency file lists 6 neighbors for Washington County. The most populous is Multnomah County, OR, with 795,897 residents. Distances run between Census internal points in a straight line.
Distance to Salem and the nearest big city
Salem is 42.6 miles S of Washington County's internal point in a straight line. The nearest place of 100,000 or more is Hillsboro, OR (population 110,337), 8.1 miles away. The nearest place of 10,000 or more is Forest Grove, OR (population 27,076), 2.1 miles away.
Washington County FIPS code
The FIPS code of Washington County is 41067: state code 41 for Oregon plus county code 067. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $103,486.
Questions people ask
What is the population of Washington County, Oregon?
The Census Vintage 2024 estimate for July 1, 2024 is 611,272. That is up 10,227 people (1.7%) from the July 2020 estimate of 601,045.
What is the FIPS code of Washington County?
41067. The first two digits (41) are Oregon; the last three (067) identify the county.
What is the largest town in Washington County?
Hillsboro, with 110,337 residents inside Washington County in 2024.
Which counties border Washington County?
6 county-equivalents border it in the Census 2024 adjacency file: Multnomah County, OR; Clackamas County, OR; Yamhill County, OR; Columbia County, OR; Clatsop County, OR; Tillamook County, OR.
Sources and data as of
Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.
- 01Census Vintage 2024 county population estimates
- 02Census 2024 Gazetteer, counties
- 03Census SAIPE 2023 state and county estimates
- 04Census Vintage 2024 subcounty population estimates
- 05Census 2024 county adjacency file
- 06Census 2024 cartographic boundary file, counties (1:5,000,000)
How every number is computed: methodology. Spotted a wrong figure? Report an error.