akashic
1876–2024
Legislative (Senate) District 18·Washington

Washington 18th State Senate District votes the way the country votes.

A Puget Sound-adjacent district decided by single digits

1876 — 2024·38 elections
WA
Latest
D+7
in 2024
Archetype
Bellwether
since the recent cycles
Population
64,656
2024 ACS

Washington 18th State Senate District, Washington: Bellwether district. In 2024, voted D+7%. Republican peak: R+57 in 1904.

Key facts

2024 presidential margin
D+7MIT Election Lab
Political archetype
BellwetherAkashic typology
Population
64,6562024 5-year
Median household income
$97,5362024 5-year
White (non-Hispanic)
75.2%2024 5-year
Black
2.2%2024 5-year
Hispanic / Latino
12.3%2024 5-year
Peak Democratic margin
D+42 in 1936MIT Election Lab
Peak Republican margin
R+57 in 1904MIT Election Lab
2024 results by constituent county
1 counties · 1 D · 0 R
R+60
D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonMarginDemocraticRepublicanTotal
D
+6.9%
17,91115,50834,591
D
+5.1%
17,55015,79734,444
D
+0.1%
11,60111,56226,075
D
+0.2%
11,67911,62524,035
D
+6.1%
11,92610,53222,858
R
−5.3%
9,94811,08721,324
R
−4.0%
7,7258,40716,952
D
+4.8%
6,5355,85214,099
D
+5.4%
5,3344,61613,324
D
+3.5%
5,0054,6639,794
R
−7.1%
4,4085,0889,625
R
−3.7%
3,8254,1559,014
D
+5.1%
3,8873,4947,654
R
−2.7%
3,3993,5997,325
D
+9.4%
2,8822,3595,562
D
+40.8%
3,6701,5385,227
D
+1.7%
2,5982,5115,111
D
+0.8%
2,4592,4184,883
R
−2.2%
2,2702,3734,669
D
+18.6%
2,1451,4443,769
D
+20.8%
2,3591,5403,946
D
+18.9%
1,6171,0982,742
D
+42.3%
1,5906092,321
D
+27.7%
1,1396131,896
R
−26.7%
5599741,556
R
−29.3%
2516521,370
R
−20.6%
3686071,163
R
−7.7%
4665531,130
O
+8.5%
3192341,002
R
−28.4%
156302514
R
−56.8%
64305424
R
−22.5%
128209360
D
+1.5%
193187388
R
−4.6%
121136325
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Demographics

Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
16.3%
English
13.2%
Irish
10.2%
American
4.5%
Italian
3.0%
French
2.7%
Scottish
2.6%
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.
Age distribution by sex
Median age: 39.1 in this county, 39.1 nationally
Male
Age
Female
0.6%
85+
1.1%
2.2%
75–84
2.5%
4.8%
65–74
5.4%
6.1%
55–64
6.3%
6.4%
45–54
6.3%
6.9%
35–44
6.9%
7.0%
25–34
6.8%
4.1%
18–24
3.9%
8.7%
5–17
8.4%
2.8%
<5
2.8%
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$97,536
Legislative (Senate) District 18 ranks near the middle of US counties.
Legislative (Senate) District 18$97,536
Washington$98,141
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
8.0%
Child poverty is below the national average.
Children under 188.6%
Working age (18–64)7.6%
Seniors (65+)9.6%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
83.5%
speak English only
Spanish6.8%
Other Indo-European5.2%
Asian & Pacific Islander3.8%
Other languages0.7%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Other Christian
26.4%
Catholic & Orthodox
6.4%
Mainline Protestant
2.4%
Pentecostal & Holiness
2.4%
Baptist
0.6%
Methodist
0.5%
Non-Christian
0.4%
Source · 2020 US Religion Census. Remaining 60.9% of residents not counted as adherents by any reporting body.

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.

The Democratic margin in Washington 18th State Senate District has rarely exceeded forty-two points in modern history; the Republican margin has rarely exceeded fifty-seven points. 2024 delivered the district to the Democratic candidate by seven points.

Its demographics resemble the country more than they resemble most districts. A 75% non-Hispanic-white share, a 8% poverty rate, and a median household income of $97,536 — all within the broad national range.

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.
Legislative (Senate) District 18, Washington. Akashic. https://akashic.app/sld-upper/53018/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0

Frequently asked questions

How did Legislative (Senate) District 18, Washington vote in 2024?
In 2024, Legislative (Senate) District 18, Washington voted Democratic by 6.9 points (D+7), carried by the Democratic candidate. Out of 34,591 votes cast, 17,911 went Democratic and 15,508 went Republican.
What is Legislative (Senate) District 18, Washington's political archetype?
Akashic classifies Legislative (Senate) District 18, Washington as a "Bellwether" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 19 times, Republican 14 times, and other 1 times.
When did Legislative (Senate) District 18, Washington last vote Republican?
The most recent presidential election in which Legislative (Senate) District 18, Washington voted Republican was 2004.
How many people live in Legislative (Senate) District 18, Washington?
Legislative (Senate) District 18, Washington has a population of 64,656 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Legislative (Senate) District 18, Washington?
Median household income in Legislative (Senate) District 18, Washington is $97,536 — above the national median of $80,734. The Washington state median is $98,141.
What is the political history of Legislative (Senate) District 18, Washington?
Akashic tracks 38 presidential elections in Legislative (Senate) District 18, Washington from 1876 to 2024. Of those, 19 went Democratic and 14 went Republican. The district's archetype — "Bellwether" — captures the overall trajectory of that voting record.