Foster leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 67% of adults in Foster typically vote, near the U.S. average of about 62%. Among adults in Foster, ~19% vote Democratic, ~48% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How Foster compares
Among cities within 25 miles, Foster leans more Republican than 10 of 21 neighbors.
Foster runs about 57 points more Republican than Oregon as a whole. Oregon leans Democratic overall, while Foster is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Foster. The southeast side is the most Republican-leaning (R+49) and the southwest side is the least Republican-leaning (R+38), a spread of about 11 points.
Why Foster 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 Foster, not a ranked or complete list of what matters most.
Foster votes against the grain of Oregon. Oregon leans Democratic overall, while Foster runs about 57 points more Republican.
High-school completion, developed land, and voter turnout
Places that combine high-school-completion-heavy adults and a rural land-use pattern tend to turn out at a higher rate, as Foster, OR does.
Why turnout in Foster looks the way it does
Turnout in Foster sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Sweet Home, OR R+40
- Cascadia, OR R+49
- Liberty, OR R+47
- Waterloo, OR R+41
- Crawfordsville, OR R+46
- Lacomb, OR R+49
- Sodaville, OR R+41
- Tallman, OR R+46
- Lebanon, OR R+33
- Brownsville, OR R+37
Cities with Similar Populations
- Nelson, VA R+42
- San Ardo, CA R+41
- Dexterville, NY R+37
- Jersey, GA R+71
- Renno, SC R+56
- Burlington, WY R+80
- Elyria, KS R+58
- Loves Mill, VA R+65
- Subligna, GA R+76
- Martin, LA R+82
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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.