Oregon State Senate District 18

State Legislative District Profile (Upper Chamber)

Overview

District ID
or-sd-018
State
Oregon
Chamber
Upper chamber (state senate)
District Code
018
Land Area
88.8 sq mi
Water Area
0.03 sq mi

Boundary

Boundary of Oregon State Senate District 18

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Washington County88.85 sq mi100.0%12.3%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Aloha CDP7.36 sq mi8.3%100.0%
Beaverton city7.07 sq mi8.0%35.8%
Hillsboro city4.88 sq mi5.5%18.5%
Cedar Hills CDP0.73 sq mi0.8%39.1%

Showing all 4 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
OR District 1125,96789.8%17.8%95.3%
OR District 614,30810.2%2.0%4.7%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
117,084
Active Voters
93,972 (80.3%)

Party Registration

PartyVotersShare
Democratic38,32832.7%
Republican19,63316.8%
Unaffiliated51,54544.0%
Other parties7,5786.5%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2023–202468,293 (58.3%)0 (0.0%)0 (0.0%)
2021–202256,008 (47.8%)0 (0.0%)0 (0.0%)
2019–202068,223 (58.3%)0 (0.0%)0 (0.0%)
2017–201849,851 (42.6%)0 (0.0%)0 (0.0%)
2015–201652,334 (44.7%)0 (0.0%)0 (0.0%)
2013–201435,272 (30.1%)0 (0.0%)0 (0.0%)
2011–201240,686 (34.7%)0 (0.0%)0 (0.0%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 10/02/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
143,950 (± 3,286)
Median Age
37.3
Median Household Income
$110,691 (± $3,446)
High School Graduate or Higher (age 25+)
90.6%
Bachelor's Degree or Higher (age 25+)
44.1%

Population by Age

GroupPeopleShare
Under 1831,06021.6%
18 to 6494,15865.4%
65 and over18,73213.0%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)30,84921.4%
White, not Hispanic77,20353.6%
Black, not Hispanic4,4553.1%
Asian, not Hispanic19,31713.4%
American Indian / Alaska Native, not Hispanic3700.3%
Native Hawaiian / Pacific Islander, not Hispanic4850.3%
Some other race, not Hispanic6950.5%
Two or more races, not Hispanic10,5767.3%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
128,095
Citizen Voting Age Population (CVAP)
98,245

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic105,15082.1%
Hispanic22,94817.9%
White77,21460.3%
Black4,1743.3%
Asian13,90710.9%
American Indian / Alaska Native3700.3%
Native Hawaiian / Pacific Islander4680.4%
Two or More Races1,5571.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic84,34685.9%
Hispanic13,89414.1%
White64,10565.3%
Black3,8363.9%
Asian14,01114.3%
American Indian / Alaska Native1,2191.2%
Native Hawaiian / Pacific Islander4090.4%
Two or More Races9611.0%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).