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Washington State Senate District 15

Washington State Senate District 15

Washington · Latest: 2024↓ R+4.7 vs 2020

Leans Republican — shifted 4.7pp toward Republicans in 2024 — 157K residents

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Washington State Senate District 15 is a state senate district that has a population of 156,689. In the 2024 presidential election, it voted Republican with a margin of R+12.3. Akashic Edge tracks 5 presidential elections here, dating back to 2008.

Washington State Senate District 15 Presidential Election Results, 2008–2024
YearDem %Rep %MarginSwing
202442.4%54.8%R+12.3R+4.7
2020*44.9%52.5%R+7.7R+6.0
2016*46.4%48.0%R+1.7D+1.3
2012*48.5%51.5%R+2.9D+2.4
2008*46.0%51.4%R+5.4—

* Pre-2022 results projected onto current district boundaries. Actual boundaries at the time of the election may have differed.

Political Identity

What defines WA-SD-15?

It has a majority-minority electorate where racial demographics are the primary driver of partisan lean.

Similarity Explorer

Similar state senate districts

Nearest neighbors matched on the same place-page feature set used across the dossier system.
8 visible matches
Historian Query

Ask the Historian

Explore WA-SD-15's political evolution with the Historian
Automated Readout

Key Insights

High-confidence patterns distilled from this geography's election history.
  • Has voted Republican in the last 5 presidential elections
  • The 2016 election was decided by just 1.7 points — razor-thin
  • Turnout decreased by 57.5 percentage points since the previous presidential election
Race & Ancestry

Who Lives Here

A race-first Census view with ancestry expansion where source coverage is strong enough to support detail.
WA-SD-15Census ACS 2024
Census race profile
Major Census race and ethnicity groups shown as a share of total population.
Expand rows for ancestry detail
Hispanic 73.3%White (Non-Hispanic) 22.6%Native American 2.5%Black 0.8%Asian 0.7%
GroupWA-SD-15StateNational
Hispanic / Latino
73.3%14.4%19.3%
White (Non-Hispanic)
22.6%63.1%57.4%
Native American / Alaska Native
2.5%1.2%0.9%
Black / African American
0.8%4.0%12.2%
Asian
0.7%9.8%6.0%
Native Hawaiian / Pacific Islander
0.1%0.7%0.2%
Method notes

Census treats race and Hispanic/Latino origin as separate questions. Race categories other than Hispanic reflect total populations (small Hispanic overlap in Black, Asian, AIAN, NHPI). “Multiracial / Other” is derived as a non-overlapping remainder.

Detailed ancestry data unavailable for this geography.

Who lives in Washington State Senate District 15? 156,689 residents as of the 2020 Census.

Demographic Comparison

Demographics

Read this geography's profile in three layers: local, state (where available), and national baseline.
WA-SD-15 vs Washington vs National157K residents
Population & electorate

Scale, voting-age share, and this geography's footprint inside the national electorate.

Total population
Local vs state vs U.S.
157K
local
157KState 7.8MNational 334.9M
Share of U.S. population
Local vs state vs U.S.
0.05%
local
0.05%National 100%
Voting-age population
Local vs state vs U.S.
67.2%
local
67.2%State 76.7%National 75.7%
Economic profile

Income, attainment, and ownership indicators that often shape coalition structure and turnout behavior.

Median household income
Local vs state vs U.S.
N/A
local
N/AState $101,109National $83,960
Poverty rate
Local vs state vs U.S.
N/A
local
N/AState 9.9%National 12.5%
College degree
Local vs state vs U.S.
N/A
local
N/AState 39.3%National 35.6%
Homeownership
Local vs state vs U.S.
N/A
local
N/AState 63.8%National 65.2%
Community profile

Age structure, language use, and nativity signals that explain how this geography differs from state and nation.

Median age
Local vs state vs U.S.
N/A
local
N/AState 38.5 yrsNational 39.1 yrs
Age 18–29
Local vs state vs U.S.
N/A
local
N/AState 15.7%National 15.7%
Age 65+
Local vs state vs U.S.
N/A
local
N/AState 16.6%National 17.0%
Foreign born
Local vs state vs U.S.
N/A
local
N/AState 15.4%National 14.1%
Non-English at home
Local vs state vs U.S.
N/A
local
N/AState 21.4%National 22.2%
English only
Local vs state vs U.S.
N/A
local
N/AState 78.6%National 77.8%
Voter Turnout

Turnout in WA-SD-15

Estimated using 2020 Census voting-age population.
2024 Turnout
33.6%
vs Previous
-57.5pp
Voting-Age Pop
105,371
History
2008–2024
Competitiveness

How competitive is WA-SD-15?

Lean RAvg margin: R+7.2 (last 3 elections)
2008
R+5.4
2012
R+2.9
2016
R+1.7
2020
R+7.7
2024
R+12.3
Elasticity
10.7pp
margin range
Party Flips
0
last 30 years
5-Elec Avg
R+6.0

Other Washington State Senate Districts

48 total
NameMargin ↓
WA-SD-43D+81.3
WA-SD-36D+80.9
WA-SD-46D+78.3
WA-SD-37D+73.3
WA-SD-34D+69.6
WA-SD-32D+53.0
WA-SD-48D+44.9
WA-SD-41D+44.5
WA-SD-01D+44.4
WA-SD-45D+44.0
WA-SD-27D+43.8
WA-SD-40D+40.9
WA-SD-22D+38.2
WA-SD-11D+36.9
WA-SD-21D+36.4
WA-SD-33D+36.1
WA-SD-23D+32.5
WA-SD-49D+24.5
WA-SD-03D+23.8
WA-SD-05D+23.6
WA-SD-28D+20.8
WA-SD-44D+20.7
WA-SD-29D+20.6
WA-SD-30D+19.8
WA-SD-38D+19.3
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