Oak Grove leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 83% of adults in Oak Grove typically vote, above the U.S. average of about 62%. Among adults in Oak Grove, ~57% vote Democratic, ~27% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Oak Grove compares
Among cities within 25 miles, Oak Grove leans more Democratic than 88 of 96 neighbors.
Oak Grove runs about 22 points more Democratic than Oregon as a whole.
Politics vary noticeably by neighborhood within Oak Grove. The northwest side is the most Democratic-leaning (D+58) and the southeast side is the least Democratic-leaning (D+28), a spread of about 30 points.
Why Oak Grove leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Oak Grove, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 96% of residents in Oak Grove live in densely developed areas, about 59 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Oak Grove sits in the top quarter (about 44%, above 90% of cities). A high never-married share predicts Democratic voting, and about 32% of adults in Oak Grove have never been married, above 79% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Oak Grove, OR sits in the top tenth nationally on this measure.
Why turnout in Oak Grove looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Oak Grove is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Oatfield, OR D+24
- Milwaukie, OR D+39
- Gladstone, OR D+17
- Johnson City, OR D+8
- Lake Oswego, OR D+45
- West Linn, OR D+33
- Clackamas, OR D+18
- Happy Valley, OR D+20
- Marylhurst, OR D+34
- Rivergrove, OR D+43
Cities with Similar Populations
- North Providence, RI D+14
- Carnegie, PA D+7
- Cairo, GA R+15
- Weehawken, NJ D+36
- Great Bend, KS R+40
- Mitchell, SD R+40
- Steamboat Springs, CO D+23
- Scottsbluff, NE R+32
- Lafayette, GA R+65
- Randleman, NC R+50
Sources and methodology
Precinct-level voting records used to fit the model come from Oregon Secretary of State, Elections Division, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.