Washington State Senate seat · lines in effect since 2024
Washington Legislative District 48
A district of about 153,000 people, 39% Asian, 74% of adults with a bachelor's degree. It votes D+47.7 relative to the nation for president.
Where it sits among all 49 seats
Every Washington State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Who lives here, compared
Grey bars show the spread of all 49 seats. Small marks are other seats in Washington. The black marker is District 48.
Higher than 96% of seats.
Lower than 94% of seats.
Lower than 94% of seats.
Lower than 52% of seats.
Highest of 49 seats.
Denser than 90% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 4173% college gradsD+46.8Not up in 2026District 45
70% college gradsD+46.0Held DDistrict 1
61% college gradsD+46.4Not up in 2026District 43
78% college gradsD+85.2Held D
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Who has held it
These lines took effect in 2024.
- Vandana Slatter (D)
2026– · Won 2025 by 17.3, 2026 unopposed
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)