Stanislaus County leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 51% of adults in Stanislaus County typically vote, below the U.S. average of about 62%. Among adults in Stanislaus County, ~23% vote Democratic, ~28% Republican, and ~49% don't vote. The map below shows estimated turnout by block group.
How Stanislaus County compares
Among counties within 50 miles, Stanislaus County leans more Republican than 2 of 4 neighbors.
Stanislaus County runs about 29 points more Republican than California as a whole. California leans Democratic overall, while Stanislaus County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Stanislaus County. The west side runs the most Democratic (D+8) and the east side runs the most Republican (R+32), a spread of about 40 points.
Why Stanislaus County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Stanislaus County, not a ranked or complete list of what matters most.
Stanislaus County votes Republican even though it is densely developed (about 82%, well above the California average of 58%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 75% of households in Stanislaus County are family households, above 95% of counties. Stanislaus County runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Never-married share, developed land, and voter turnout
Places that combine a never-married-heavy adult population and a heavily developed built environment tend to turn out at a lower rate, as Stanislaus County, CA does.
Why turnout in Stanislaus County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Stanislaus County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 38% of households in Stanislaus County rent, above 92% of counties. High food insecurity lines up with lower turnout, and about 22% of adults in Stanislaus County report food insecurity, above 83% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- San Joaquin County, CA D+4
- Merced County, CA R+3
- Calaveras County, CA R+29
- Tuolumne County, CA R+18
- Mariposa County, CA R+16
- Amador County, CA R+35
- Santa Clara County, CA D+32
- San Benito County, CA D+12
- Contra Costa County, CA D+36
- Alameda County, CA D+49
Counties with Similar Populations
- Lancaster County, PA R+17
- Ramsey County, MN D+43
- Volusia County, FL R+17
- Dane County, WI D+48
- Pasco County, FL R+24
- Guilford County, NC D+30
- Summit County, OH D+10
- Spokane County, WA R+3
- Montgomery County, OH D+6
- New Castle County, DE D+33
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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.