South Bolton leans heavily Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.
About 94% of adults in South Bolton typically vote, above the U.S. average of about 62%. Among adults in South Bolton, ~61% vote Democratic, ~33% Republican, and ~6% don't vote. The map below shows estimated turnout by block group.
How South Bolton compares
Among cities within 25 miles, South Bolton leans more Democratic than 103 of 150 neighbors.
South Bolton runs about 6 points more Democratic than Massachusetts as a whole.
Why South Bolton 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 South Bolton, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 84% of adults in South Bolton hold a bachelor's degree, about 56 points above the U.S. average of 28%.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; South Bolton, MA sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in South Bolton looks the way it does
Areas with strong routine healthcare access turn out at higher rates. South Bolton 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 81%, about 21 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 95% of households in South Bolton own their home, about 20 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and more than 99% of adults in South Bolton have completed high school, in the top fraction of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Bolton, MA D+28
- Still River, MA D+34
- Harvard, MA D+28
- Stow, MA D+34
- Hudson, MA D+15
- Harvard Station, MA D+29
- Boxborough, MA D+26
- Berlin, MA D+18
- Lancaster, MA D+11
- Clinton, MA D+12
Cities with Similar Populations
- Morena, CA R+33
- Range, WI R+34
- Peruville, NY R+3
- Brozville, MS D+58
- Hall, NY R+31
- Ashuelot, NH R+24
- Palmetto, LA R+22
- Oak Vale, MS D+4
- Pea Ridge, AL R+87
- Penola, VA R+3
Sources and methodology
Precinct-level voting records used to fit the model come from Massachusetts Secretary of the Commonwealth, 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.