Keystone leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 40% of adults in Keystone typically vote, below the U.S. average of about 62%. Among adults in Keystone, ~25% vote Democratic, ~15% Republican, and ~60% don't vote. The map below shows estimated turnout by block group.
How Keystone compares
Among cities within 25 miles, Keystone is the most Democratic-leaning.
Politically, Keystone sits close to the rest of California.
Politics vary noticeably by neighborhood within Keystone. The north side runs the most Democratic (D+32) and the west side runs the most Republican (R+49), a spread of about 81 points.
Why Keystone 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 Keystone, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 41% of residents in Keystone live in densely developed areas, above 84% of cities. A high never-married share predicts Democratic voting, and about 65% of adults in Keystone have never been married, in the top fraction of cities.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Keystone, CA sits in the top 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 Keystone looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Keystone is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 49%, about 13 points below the California average of 62%. High food insecurity lines up with lower turnout, and about 26% of adults in Keystone report food insecurity, above 92% of cities. Low high-school completion lines up with lower turnout, and about 68% of adults in Keystone have completed high school, below 98% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Copperopolis, CA R+41
- Chinese Camp, CA R+49
- Quartz, CA R+32
- Jamestown, CA R+23
- Tuttletown, CA R+25
- Columbia, CA R+18
- Angels, CA R+30
- Sonora, CA R+17
- Vallecito, CA R+15
- Altaville, CA R+21
Cities with Similar Populations
- Westport, WA Even
- Hahnville, LA D+6
- Casco, MI R+45
- Cathlamet, WA R+15
- Upland, PA D+35
- Laporte, MN R+33
- Steele, AL R+80
- Alpine, NJ Even
- Beresford, SD R+49
- Sugar City, ID R+59
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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.