Island Mountain leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 48% of adults in Island Mountain typically vote, below the U.S. average of about 62%. Among adults in Island Mountain, ~27% vote Democratic, ~22% Republican, and ~51% don't vote. The map below shows estimated turnout by block group.
How Island Mountain compares
Among cities within 25 miles, Island Mountain leans more Democratic than 2 of 14 neighbors.
Island Mountain runs about 9 points more Republican than California as a whole.
Politics vary noticeably by neighborhood within Island Mountain. The east side runs the most Democratic (D+31) and the northeast side runs the most Republican (R+22), a spread of about 52 points.
Why Island Mountain leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Island Mountain. The lean here lands roughly where demographic data alone would predict.
Park access and Democratic lean
Places with heavy park coverage tend to lean Democratic; Island Mountain, CA sits in the top quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Island Mountain looks the way it does
Areas with high food insecurity turn out at lower rates. About 26% of adults in Island Mountain report food insecurity, about 10 points above the U.S. average of 16%. Limited routine healthcare access lines up with lower turnout, and Island Mountain sits in the bottom quarter on routine-care measures. Low high-school completion lines up with lower turnout, and about 78% of adults in Island Mountain have completed high school, below 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Harris, CA D+32
- Cummings, CA D+35
- Zenia, CA R+21
- Alderpoint, CA D+23
- Covelo, CA D+17
- Leggett, CA D+50
- Piercy, CA D+48
- Benbow, CA D+21
- Fort Seward, CA D+9
- Garberville, CA D+24
Cities with Similar Populations
- Pyrites, NY R+2
- Di Giorgio, CA R+31
- Elkol, WY R+78
- Pike, CA R+10
- Pecan, PA R+53
Sources and methodology
Precinct-level voting records used to fit the model come from California Secretary of State, Elections, 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.