state senate districtWashington 18th State Senate District
presidential margin
2004–2024 · Democratic minus Republican
2004R+9.3
2008D+2.2
2012R+3.8
2016R+4.4
2020R+0.03
2024D+2.4
net swing · 2004→2024D+11.6R+9.3 → D+2.4
vs. U.S. · 2024D+3.8D+2.4 vs R+1.5
presidential returns
2024 turnout 74.7% of 118,051 citizens 18+
Year
Democrat
Republican
Others
Total
CVAP
Turnout
2024
43,672
41,596
2,881
88,149
118,051
74.7%
2020
42,583
42,607
2,777
87,967
108,370†
81.2%
2016
27,655
30,420
4,597
62,672
99,098†
63.2%
2012
27,097
29,291
1,768
58,156
92,445†
62.9%
2008
28,052
26,817
1,007
55,876
89,205†
62.6%
2004
23,408
28,275
830
52,513
85,964†
61.1%
† Citizen voting-age population estimated for prior cycles from the constituent-county ACS trend anchored to the current figure. Source: ACS 5-year, table B05003.
——
D+60R+60
20042024
Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab
People and households
Who lives here
Exact values for this place, its state, and the United States.
Race · ethnicity · ancestry
Communities and origins
GroupWA SD 18WashingtonUnited States
German17.5%14.5%12.5%
English14.1%12.1%9.5%
Irish10.9%9.8%9.4%
American4.8%3.8%5.3%
Norwegian3.8%4.0%—
Italian3.2%3.1%4.8%
French2.9%—1.6%
Scottish2.8%2.6%1.3%
Mexican8.1%10.8%11.3%
Puerto Rican0.3%0.5%1.8%
Spaniard0.3%0.4%—
Guatemalan0.3%0.2%0.5%
Salvadoran0.3%0.4%0.7%
Spanish0.3%0.3%—
Cuban0.2%—0.7%
Chinese1.0%2.2%1.3%
Vietnamese0.7%1.1%0.6%
Filipino0.6%1.5%0.9%
Asian Indian0.4%2.0%1.4%
Korean0.4%0.9%0.4%
Japanese0.3%0.4%0.2%
Hmong0.2%——
African American†1.4%2.3%9.9%
African0.2%0.4%0.5%
Samoan0.7%0.2%—
Chuukese0.7%——
Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.
Age and life stage
Measure
WA SD 18
Washington
United States
Median age
39.4
38.5
39.1
Age 18–24
8.0%
8.5%
9.2%
Age 65 and older
16.6%
16.7%
17.2%
Household economy
Measure
WA SD 18
Washington
United States
Median household income
$106,750
$98,141
$84,427
Poverty rate
6.8%
9.9%
12.5%
Bachelor's degree or higher (25+)
33.3%
39.3%
35.6%
Languages at home
Measure
WA SD 18
Washington
United States
Speaks a non-English language at home
16.5%
21.5%
22.3%
Spanish
6.8%
9.1%
13.6%
Russian, Polish, or other Slavic
3.3%
1.5%
0.7%
Other Indo-European
1.3%
2.1%
2.0%
Other Asian & Pacific Island
1.3%
2.1%
1.1%
Religious landscape
Measure
WA SD 18
Washington
United States
Catholic
—
10.7%
18.6%
Evangelical Protestant
—
20.5%
16.5%
Unclaimed / not counted
—
58.8%
51.5%
American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024 · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations.
Washington 18th State Senate District
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
−9.3%
2008
+2.2%
2012
−3.8%
2016
−4.4%
2020
−0.0%
2024
+2.4%
DemocraticRepublican
6 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024). Swing · margin change from the prior cycle. vs U.S. · margin relative to the national result that year. Third-party votes in 2012 are allocated from certified county totals by this place's share of each county's two-party vote — that cycle's precinct source records two-party splits. † 2004 sub-county results are estimated: the source's block-level detail for this cycle was unreliable — either county/municipality-level consolidated reporting (COVID-era) or a precinct-to-block allocation that misplaced votes — so the figures are allocated from the constituent county totals in proportion to the place and scaled to certified totals.
Year
Won
Democratic
Republican
Other
Margin
Swing
vs U.S.
Total
D
49.5%Harris43,672
47.2%Trump41,596
3.3%
D+2.4
D+2.4
D+3.8
88,149
R
48.4%Biden42,583
48.4%Trump42,607
3.2%
R+0.03
D+4.4
R+4.5
87,967
R
44.1%Clinton27,655
48.5%Trump30,420
7.3%
R+4.4
R+0.6
R+6.5
62,672
R
46.6%Obama27,097
50.4%Romney29,291
3.0%
R+3.8
R+6.0
R+7.6
58,156
D
50.2%Obama28,052
48.0%McCain26,817
1.8%
D+2.2
D+11.5
R+5.1
55,876
R
44.6%Kerry23,408
53.8%Bush28,275
1.6%
R+9.3
—
R+6.8
52,513
current representation
Current officeholders
DAdrian CortesState Senate · 18
State legislative officeholder from OpenStates nightly current-legislator data.
Washington's 18th Senate District sits in the southwest corner of the state near the Oregon border, where suburban growth around Vancouver has steadily compressed margins that once ran far wider, making it a consistent target for both parties.
Across the recorded series it reached a Democratic high of 2.4 points in 2024 and a Republican high of 9.3 points in 2004. 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 (Senate) District 17 and Legislative (Senate) District 26.
Akashic
Political twins — state-senate districts
The state-senate 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.
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 18th State Senate District. Akashic. https://akashic.app/sld-upper/53018/. Accessed May 20, 2026. License: CC BY 4.0.
How did Washington 18th State Senate District vote in 2024?
In 2024, Washington 18th State Senate District voted Democratic by 2.4 points (D+2.4), carried by the Democratic candidate. Out of 88,149 votes cast, 43,672 went Democratic and 41,596 went Republican.
When did Washington 18th State Senate District last vote Republican?
The most recent presidential election in which Washington 18th State Senate District voted Republican was 2020.
How many people live in Washington 18th State Senate District?
Washington 18th State Senate District has a population of 157,021 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Washington 18th State Senate District?
Median household income in Washington 18th State Senate District is $106,750 — above the national median of $80,734. The Washington state median is $98,141.
What is the political history of Washington 18th State Senate District?
Akashic tracks 6 presidential elections in Washington 18th State Senate District from 2004 to 2024. Of those, 2 went Democratic and 4 went Republican.
