Edison leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 43% of adults in Edison typically vote, below the U.S. average of about 62%. Among adults in Edison, ~14% vote Democratic, ~29% Republican, and ~57% don't vote. The map below shows estimated turnout by block group.
How Edison compares
Among cities within 25 miles, Edison leans more Republican than 8 of 15 neighbors.
Edison runs about 56 points more Republican than California as a whole. California leans Democratic overall, while Edison is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Edison. The southeast side is the most Republican-leaning (R+46) and the southwest side is the least Republican-leaning (R+23), a spread of about 23 points.
Why Edison 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 Edison, not a ranked or complete list of what matters most.
Edison votes against the grain of California. California leans Democratic overall, while Edison runs about 56 points more Republican. Low college attainment predicts Republican voting, and Edison sits in the bottom quarter (about 13%, below 84% of cities). A high family-household share predicts Republican voting, and about 80% of households in Edison are family households, above 89% of cities.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; Edison, CA sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Edison looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Edison is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. High food insecurity lines up with lower turnout, and about 25% of adults in Edison report food insecurity, above 91% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Di Giorgio, CA R+31
- Cawelo, CA R+52
- Lamont, CA D+15
- Edmundson Acres, CA Even
- Weedpatch, CA Even
- Bakersfield, CA R+12
- Arvin, CA D+9
- Oildale, CA R+34
- Pumpkin Center, CA R+29
- Keene, CA R+41
Cities with Similar Populations
- Cimarron City, OK R+67
- Xenia, KS R+64
- Mindenville, NY R+46
- Rogerson, ID R+71
- Hazen, AL D+73
- West Falls, PA R+39
- Buffalo, MT R+61
- Stehekin, WA R+22
- Butlerville, OH R+69
- Maltersville, IN R+54
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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.