Summit City leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 61% of adults in Summit City typically vote, near the U.S. average of about 62%. Among adults in Summit City, ~18% vote Democratic, ~43% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How Summit City compares
Among cities within 25 miles, Summit City leans more Republican than 14 of 22 neighbors.
Summit City runs about 60 points more Republican than California as a whole. California leans Democratic overall, while Summit City is one of the few Republican-leaning pockets.
Why Summit City 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 Summit City, not a ranked or complete list of what matters most.
Summit City votes against the grain of California. California leans Democratic overall, while Summit City runs about 60 points more Republican. Car-dependent areas vote Republican, and about 87% of residents in Summit City drive to work alone, above 87% of cities.
Housing overcrowding and voter turnout
Places with heavy housing overcrowding tend to turn out at a lower rate; Summit City, CA sits above the national average on this measure.
Why turnout in Summit City looks the way it does
Turnout in Summit City 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
- Shasta Lake, CA R+35
- Keswick, CA R+41
- Shasta, CA R+35
- Redding, CA R+25
- French Gulch, CA R+35
- Whiskeytown, CA R+39
- Obrien, CA R+38
- Bella Vista, CA R+46
- Palo Cedro, CA R+42
- Lakehead, CA R+26
Cities with Similar Populations
- Bacova, VA R+46
- Coal Bluff, AL D+19
- Oxford, WV R+71
- Plainview, OK R+76
- Claudell, KS R+78
- Oklahoma, KY 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.