Glenbrook leans Republican by roughly 16 points: about 42% of voters vote Democratic and 58% Republican.
About 65% of adults in Glenbrook typically vote, near the U.S. average of about 62%. Among adults in Glenbrook, ~27% vote Democratic, ~38% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How Glenbrook compares
Among cities within 25 miles, Glenbrook leans more Republican than 13 of 38 neighbors.
Glenbrook runs about 30 points more Republican than Oregon as a whole. Oregon leans Democratic overall, while Glenbrook is one of the few Republican-leaning pockets.
Why Glenbrook 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 Glenbrook, not a ranked or complete list of what matters most.
Glenbrook votes against the grain of Oregon. Oregon leans Democratic overall, while Glenbrook runs about 30 points more Republican. Rural areas vote Republican, and Glenbrook sits in the bottom quarter on density (about 3%, below 90% of cities).
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Glenbrook, OR sits in the bottom quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Glenbrook looks the way it does
Turnout in Glenbrook sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Horton, OR R+21
- Monroe, OR R+18
- Dawson, OR R+12
- Cheshire, OR R+20
- Bellfountain, OR R+15
- Blachly, OR R+16
- Lancaster, OR R+26
- Junction City, OR R+11
- Noti, OR R+21
- Miller, OR R+54
Cities with Similar Populations
- Thompsonville, TX R+21
- Alamo, ND R+77
- Union Valley, NY R+45
- Athens, MS R+76
- Richardson, KY R+77
- Melrose, AL R+16
- Twomile, OR R+9
- Livingstonville, NY R+41
- Lodgepole, SD R+70
- Windham, MT R+63
All Local Stats
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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.