Penngrove leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.
About 81% of adults in Penngrove typically vote, above the U.S. average of about 62%. Among adults in Penngrove, ~51% vote Democratic, ~30% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How Penngrove compares
Among cities within 25 miles, Penngrove leans more Democratic than 4 of 58 neighbors.
Penngrove runs about 6 points more Democratic than California as a whole.
Politics vary noticeably by neighborhood within Penngrove. The northwest side is the most Democratic-leaning (D+30) and the east side is the least Democratic-leaning (D+20), a spread of about 10 points.
Why Penngrove 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 Penngrove, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 39% of residents in Penngrove live in densely developed areas, above 84% of cities. High college attainment predicts Democratic voting, and Penngrove sits in the top quarter (about 47%, above 92% of cities).
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Penngrove, CA sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Penngrove looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Penngrove 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 69%, about 9 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Cotati, CA D+40
- Rohnert Park, CA D+38
- Petaluma, CA D+42
- Lakeville, CA D+15
- El Verano, CA D+43
- Glen Ellen, CA D+54
- Eldridge, CA D+44
- Kenwood, CA D+53
- Santa Rosa, CA D+42
- Sonoma, CA D+48
Cities with Similar Populations
- Danville, NH R+12
- Mine Hill, NJ R+3
- Columbus, TX R+37
- Hiawassee, GA R+54
- Petersburg, IL R+32
- Ivanhoe, CA R+2
- East Harwich, MA D+16
- Boalsburg, PA D+21
- Vacherie, LA D+21
- Point Pleasant Beach, NJ R+20
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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.