- Lead
- 2,095
- Total
- 88,374
- vs nation
- D+3.8
Washington 18th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 10
- Total
- 88,135
- vs nation
- R+4.5
- Lead
- 3,068
- Total
- 66,990
- vs nation
- R+6.7
- Lead
- 3,058
- Total
- 61,798
- vs nation
- R+8.8
- Lead
- 543
- Total
- 59,147
- vs nation
- R+6.4
- Lead
- 5,795
- Total
- 54,899
- vs nation
- R+8.1
- Lead
- 3,885
- Total
- 43,531
- vs nation
- R+9.4
- Lead
- 89
- Total
- 36,381
- vs nation
- R+8.3
Key facts
- 2024 presidential margin
- D+2.4MIT Election Lab
- Population
- 157,0212024 5-year
- Population density
- 1,920 / sq mi2024 5-year · TIGER/Line
- Land area
- 81.8 sq miTIGER/Line
- Median household income
- $106,7502024 5-year
- White (non-Hispanic)
- 75.3%2024 5-year
- Black
- 1.8%2024 5-year
- Hispanic / Latino
- 10.4%2024 5-year
- Peak Democratic margin
- D+36.4 in 1936MIT Election Lab
- Peak Republican margin
- R+60.8 in 1904MIT Election Lab
- Most similar
- Legislative (House) District 17, WA · twin score 94.8
presidential history
Party record book
Washington 18th State House District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 · 34 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Lyndon B. Johnson1964
67.8%
8,923 votes · D+35.9 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 65.6%
Republican
Theodore Roosevelt1904
74.0%
864 votes · R+60.8 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 65.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Kamala Harris2024
43,791votes
49.6% of the vote · D+2.4 · modeled estimate
Runner-up · Joe Biden, 2020 · 42,671 votes
Republican
Donald Trump2020
42,681votes
48.4% of the vote · R+0.01 · modeled estimate
Runner-up · Donald Trump, 2024 · 41,696 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
George McGovern1972
+15.4pts D vs U.S.
Place R+7.8 · U.S. R+23.2 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · +13.3 pts
Republican
Theodore Roosevelt1904
+41.1pts R vs U.S.
Place R+60.8 · U.S. R+19.7 · modeled estimate
Runner-up · William H. Taft, 1908 · +22.8 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
Washington's 18th House District sits in Clark County's suburban fringe, where a D+2.4 presidential margin in 2024 reflects a competitive electorate that has shifted noticeably from its earlier Republican lean.
Across the recorded series it reached a Democratic high of 36.4 points in 1936 and a Republican high of 60.8 points in 1904. Between 2020 and 2024 the district moved 2.4 points toward the Democratic candidate; the 2024 margin was 2.4 points.
A population of 157,021, a 75% non-Hispanic-white share, and a median household income of $106,750 describe the district. The district's voting pattern over the last decade is most similar to that of Legislative (House) District 17 and Legislative (House) District 26.
The state-house districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
Washington 18th State House District. Akashic. https://akashic.app/sld-lower/53018/. Accessed May 20, 2026. License: CC BY 4.0.