Boulder Creek leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 65% of adults in Boulder Creek typically vote, near the U.S. average of about 62%. Among adults in Boulder Creek, ~44% vote Democratic, ~21% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How Boulder Creek compares
Among cities within 25 miles, Boulder Creek leans more Democratic than 19 of 48 neighbors.
Boulder Creek runs about 17 points more Democratic than California as a whole.
Politics vary noticeably by neighborhood within Boulder Creek. The northeast side is the most Democratic-leaning (D+59) and the south side is the least Democratic-leaning (D+22), a spread of about 37 points.
Why Boulder Creek 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 Boulder Creek, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 42% of adults in Boulder Creek hold a bachelor's degree, about 14 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 32% of adults in Boulder Creek have never been married, above 80% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Boulder Creek, CA sits in the top tenth 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 Boulder Creek looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Boulder Creek 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 72%, about 12 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Brookdale, CA D+36
- Forest Springs, CA D+41
- San Lorenzo Park, CA D+47
- Lompico, CA D+30
- Ben Lomond, CA D+31
- Felton, CA D+39
- Swanton, CA D+54
- Davenport, CA D+52
- Mount Hermon, CA D+46
- Scotts Valley, CA D+42
Cities with Similar Populations
- Plumas Lake, CA R+26
- Apple Creek, OH R+65
- Trinity, AL R+68
- Oakhurst, CA R+20
- Mount Pleasant, NC R+61
- Broadway, VA R+50
- Midway, GA R+23
- Kasson, MN R+20
- Citrus, CA D+22
- St. Paul Park, MN D+3
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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.