Coos County leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 79% of adults in Coos County typically vote, above the U.S. average of about 62%. Among adults in Coos County, ~36% vote Democratic, ~43% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How Coos County compares
Coos County runs about 24 points more Republican than Oregon as a whole. Oregon leans Democratic overall, while Coos County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Coos County. The southwest side runs the most Democratic (Even) and the south side runs the most Republican (R+33), a spread of about 35 points.
Why Coos County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Coos County, not a ranked or complete list of what matters most.
Coos County votes against the grain of Oregon. Oregon leans Democratic overall, while Coos County runs about 24 points more Republican.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Coos County, OR sits in the top quarter nationally on this measure.
Why turnout in Coos County looks the way it does
Turnout in Coos County 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 Counties
- Douglas County, OR R+29
- Curry County, OR R+11
- Lane County, OR D+21
- Josephine County, OR R+25
- Jackson County, OR R+3
- Lincoln County, OR D+13
- Benton County, OR D+42
- Del Norte County, CA R+15
- Linn County, OR R+25
- Polk County, OR R+4
Counties with Similar Populations
- Salem County, NJ R+12
- Pulaski County, KY R+59
- Effingham County, GA R+46
- Carbon County, PA R+35
- Columbia County, PA R+32
- Chaves County, NM R+37
- Lincoln County, SD R+29
- Nacogdoches County, TX R+29
- Jefferson County, OH R+35
- Liberty County, GA D+16
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.