Wellesley is a Democratic stronghold. About 75% of voters here vote Democratic and 25% Republican.
About 81% of adults in Wellesley typically vote, above the U.S. average of about 62%. Among adults in Wellesley, ~61% vote Democratic, ~20% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How Wellesley compares
Among cities within 25 miles, Wellesley leans more Democratic than 145 of 171 neighbors.
Wellesley runs about 26 points more Democratic than Massachusetts as a whole.
Politics vary noticeably by neighborhood within Wellesley. The south side is the most Democratic-leaning (D+57) and the north side is the least Democratic-leaning (D+36), a spread of about 21 points.
Why Wellesley 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 Wellesley, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 89% of adults in Wellesley hold a bachelor's degree, about 60 points above the U.S. average of 28%. Dense areas vote Democratic, and Wellesley sits in the top fifth on density (about 90%, above 96% of cities). A high never-married share predicts Democratic voting, and about 34% of adults in Wellesley have never been married, above 86% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Wellesley, MA sits in the top tenth nationally on this measure.
Why turnout in Wellesley looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Wellesley 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 79%, about 19 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 99% of adults in Wellesley have completed high school, above 98% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Newton Lower Falls, MA D+54
- Needham, MA D+46
- Waban, MA D+57
- Auburndale, MA D+59
- Newton Upper Falls, MA D+59
- Weston, MA D+33
- Natick, MA D+41
- Cochituate, MA D+43
- Newton Highlands, MA D+62
- Dover, MA D+38
Cities with Similar Populations
- Clover, SC R+44
- Winchester, NV D+25
- Arlington, TN R+19
- Johnston, RI R+4
- Dodge City, KS R+20
- Milton, MA D+45
- Clearfield, UT R+18
- Middleton, WI D+53
- South Lake Tahoe, CA D+18
- North Royalton, OH R+14
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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.