Washington County, Oregon: New American county. In 2024, voted D+34%. Republican peak: R+58 in 1904.
Key facts
- 2024 presidential margin
- D+34MIT Election Lab
- Political typology
- New AmericanAkashic typology
- Population
- 603,9472024 5-year
- Median household income
- $107,7722024 5-year
- White (non-Hispanic)
- 63.5%2024 5-year
- Black
- 2.3%2024 5-year
- Hispanic / Latino
- 18.6%2024 5-year
- Peak Democratic margin
- D+35 in 2020MIT Election Lab
- Peak Republican margin
- R+58 in 1904MIT Election Lab
- Most similar
- Howard County, MD · similarity 0.99
2024 results by precinct
2024 precinct map of Washington CountyPrecinct-level 2024 presidential results for Washington County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | −43.4% |
| 1896 | −13.9% |
| 1900 | −18.4% |
| 1904 | −57.5% |
| 1908 | −31.2% |
| 1912 | +3.6% |
| 1916 | −17.5% |
| 1920 | −35.1% |
| 1924 | −23.0% |
| 1928 | −26.5% |
| 1932 | +22.7% |
| 1936 | +33.0% |
| 1940 | +1.5% |
| 1944 | −1.3% |
| 1948 | −9.4% |
| 1952 | −28.7% |
| 1956 | −22.1% |
| 1960 | −17.8% |
| 1964 | +16.5% |
| 1968 | −18.7% |
| 1972 | −21.4% |
| 1976 | −19.3% |
| 1980 | −17.3% |
| 1984 | −25.9% |
| 1988 | −5.6% |
| 1992 | +6.2% |
| 1996 | +7.1% |
| 2000 | +2.5% |
| 2004 | +6.0% |
| 2008 | +22.1% |
| 2012 | +17.4% |
| 2016 | +26.0% |
| 2020 | +34.6% |
| 2024 | +33.7% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 192,641 | 92,427 | 297,369 | ||
| D | 209,940 | 99,073 | 320,326 | ||
| D | 153,251 | 83,197 | 269,232 | ||
| D | 135,291 | 93,974 | 237,023 | ||
| D | 141,544 | 89,185 | 236,632 | ||
| D | 121,140 | 107,223 | 231,308 | ||
| D | 90,662 | 86,091 | 185,974 | ||
| D | 76,619 | 65,221 | 159,755 | ||
| D | 67,528 | 57,146 | 167,195 | ||
| R | 59,837 | 67,018 | 129,211 | ||
| R | 44,602 | 75,877 | 120,896 | ||
| R | 37,915 | 57,165 | 111,355 | ||
| R | 34,847 | 52,376 | 90,611 | ||
| R | 27,890 | 43,958 | 75,238 | ||
| R | 22,943 | 34,105 | 59,842 | ||
| D | 29,081 | 20,813 | 50,181 | ||
| R | 17,736 | 25,415 | 43,186 | ||
| R | 14,027 | 22,001 | 36,028 | ||
| R | 11,191 | 20,250 | 31,584 | ||
| R | 9,424 | 11,455 | 21,589 | ||
| R | 9,110 | 9,362 | 18,677 | ||
| D | 8,626 | 8,367 | 17,103 | ||
| D | 8,641 | 4,148 | 13,612 | ||
| D | 6,824 | 4,201 | 11,573 | ||
| R | 3,544 | 6,162 | 9,879 | ||
| R | 2,103 | 4,203 | 9,141 | ||
| R | 2,262 | 4,947 | 7,641 | ||
| R | 3,363 | 4,888 | 8,703 | ||
| O | 1,429 | 1,261 | 4,659 | ||
| R | 1,153 | 2,319 | 3,743 | ||
| R | 492 | 2,296 | 3,137 | ||
| R | 1,114 | 1,655 | 2,948 | ||
| R | 1,566 | 2,082 | 3,708 | ||
| R | 293 | 1,587 | 2,979 | ||
| — | — | — | — | ||
| — | — | — | — | ||
| — | — | — | — | ||
| — | — | — | — |
Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
14.2%
English
12.8%
Irish
9.1%
American
5.1%
Italian
3.1%
Scottish
2.6%
French
2.2%
African American
1.8%
Multiple ancestry combinations reported; no single grouping above 1%.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 38.1 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$107,772
Washington County ranks in the top 5% of US counties.
Washington County$107,772
Oregon$83,011
United States$80,734
Washington County ranks in the top 5% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
8.1%
Child poverty is below the national average.
Children under 188.6%
Working age (18–64)7.6%
Seniors (65+)10.9%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
74.2%
speak English only
Spanish12.2%
Asian & Pacific Islander6.8%
Other Indo-European5.1%
Other languages1.5%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 65.6% of residents not counted as adherents by any reporting body.
Washington County has shifted from competitive terrain to a reliable Democratic stronghold over two decades, driven by rapid population growth in the Hillsboro–Beaverton tech corridor and an increasingly diverse, college-educated electorate.
Washington County has leaned Democratic in recent presidential elections, reaching a Democratic margin of thirty-five points in 2020. Between 2020 and 2024 it moved one point toward the Republican candidate — part of the sharpest rightward shift recorded among any group of places in the country.
Its demographics describe the shift: a 64% non-Hispanic-white share, a median household income of $107,772, and a population of 603,947. The county's voting pattern over the last decade is most similar to that of Howard County and Santa Barbara County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Washington County, Oregon. Akashic. https://akashic.app/county/41067/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More new american counties
Frequently asked questions
How did Washington County, Oregon vote in 2024?
In 2024, Washington County, Oregon voted Democratic by 33.7 points (D+34), carried by the Democratic candidate. Out of 297,369 votes cast, 192,641 went Democratic and 92,427 went Republican.
What is Washington County, Oregon's political typology?
Akashic places Washington County, Oregon in the "New American" typology — Communities where a large share of households speak a language other than English — multilingual, Democratic-leaning overall, yet the hardest-swinging bloc toward the Republican Party in 2024. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 13 times, Republican 20 times, and other 1 times.
When did Washington County, Oregon last vote Republican?
The most recent presidential election in which Washington County, Oregon voted Republican was 1988.
How many people live in Washington County, Oregon?
Washington County, Oregon has a population of 603,947 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Washington County, Oregon?
Median household income in Washington County, Oregon is $107,772 — above the national median of $80,734. The Oregon state median is $83,011.
What is the political history of Washington County, Oregon?
Akashic tracks 38 presidential elections in Washington County, Oregon from 1876 to 2024. Of those, 13 went Democratic and 20 went Republican. The county's typology — "New American" — captures where that record, its demographics, and its recent swing place it among American communities.