Isleton leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 46% of adults in Isleton typically vote, below the U.S. average of about 62%. Among adults in Isleton, ~20% vote Democratic, ~26% Republican, and ~54% don't vote. The map below shows estimated turnout by block group.
How Isleton compares
Among cities within 25 miles, Isleton leans more Republican than 31 of 48 neighbors.
Isleton runs about 34 points more Republican than California as a whole. California leans Democratic overall, while Isleton is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Isleton. The north side is the most Republican-leaning (R+18) and the south side is the least Republican-leaning (R+8), a spread of about 10 points.
Why Isleton 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 Isleton, not a ranked or complete list of what matters most.
Isleton votes against the grain of California. California leans Democratic overall, while Isleton runs about 34 points more Republican.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; Isleton, CA sits below the national average on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Isleton looks the way it does
Crowded housing lines up with lower turnout. About 12% of homes in Isleton have more than one occupant per room, above 98% of cities. High-crime urban areas turn out at lower rates, and Isleton sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Walker Landing, CA Even
- Rio Vista, CA D+3
- Ryde, CA R+5
- Walnut Grove, CA R+7
- Howard Landing, CA D+12
- Locke, CA R+25
- Bethel Island, CA R+15
- Vorden, CA R+15
- Bridgehead, CA R+8
- Birds Landing, CA R+33
Cities with Similar Populations
- Sharpsville, IN R+54
- McGraw, NY R+39
- Hinsdale, MA Even
- Shanks, WV R+65
- Chimacum, WA D+27
- Sweet Springs, MO R+54
- Poestenkill, NY R+15
- Houston, DE R+36
- Strum, WI R+33
- Cole, OK R+70
All Local Stats
Home Services
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.