Millville leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 65% of adults in Millville typically vote, near the U.S. average of about 62%. Among adults in Millville, ~18% vote Democratic, ~47% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How Millville compares
Among cities within 25 miles, Millville leans more Republican than 20 of 25 neighbors.
Millville runs about 65 points more Republican than California as a whole. California leans Democratic overall, while Millville is one of the few Republican-leaning pockets.
Why Millville 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 Millville, not a ranked or complete list of what matters most.
Millville votes against the grain of California. California leans Democratic overall, while Millville runs about 65 points more Republican. Rural areas vote Republican, and Millville sits in the bottom quarter on density (about 3%, below 89% of cities). A high family-household share predicts Republican voting, and about 77% of households in Millville are family households, above 81% of cities.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Millville, CA sits in the bottom 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 Millville looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Millville is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 68%, about 8 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Millville have completed high school, above 85% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Palo Cedro, CA R+42
- Bella Vista, CA R+46
- Balls Ferry, CA R+50
- Oak Run, CA R+39
- Anderson, CA R+36
- Obrien, CA R+38
- Redding, CA R+25
- Whitmore, CA R+41
- Ingot, CA R+39
- Shingletown, CA R+38
Cities with Similar Populations
- Jenera, OH R+59
- Delhi, IA R+42
- Mountain Village, CO D+48
- Otis, NM R+59
- Park Hall, MD D+4
- Franklin, IL R+55
- Culvertown, KY R+58
- Conway, WA R+5
- Cheltenham, MD D+83
- Newport, DE D+22
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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.