Dedham leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.
About 80% of adults in Dedham typically vote, above the U.S. average of about 62%. Among adults in Dedham, ~50% vote Democratic, ~30% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How Dedham compares
Among cities within 25 miles, Dedham leans more Democratic than 88 of 158 neighbors.
Politically, Dedham sits close to the rest of Massachusetts.
Politics vary noticeably by neighborhood within Dedham. The west side is the most Democratic-leaning (D+44) and the southeast side is the least Democratic-leaning (D+18), a spread of about 26 points.
Why Dedham 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 Dedham, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 84% of residents in Dedham live in densely developed areas, about 48 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Dedham sits in the top quarter (about 56%, above 96% of cities). A high never-married share predicts Democratic voting, and about 32% of adults in Dedham have never been married, above 81% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Dedham, MA 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 Dedham looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Dedham 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
- Hyde Park, MA D+59
- West Roxbury, MA D+40
- Westwood, MA D+28
- Roslindale, MA D+61
- Norwood, MA D+23
- Milton, MA D+45
- Needham, MA D+46
- Mattapan, MA D+74
- Chestnut Hill, MA D+60
- Newton Highlands, MA D+62
Cities with Similar Populations
- Taylorsville, NC R+54
- Yucca Valley, CA R+22
- Fish Hawk, FL R+24
- Parlin, NJ Even
- Hopewell Junction, NY R+17
- Dickson, TN R+51
- Farmington, MO R+41
- Ronkonkoma, NY R+26
- Radcliff, KY R+10
- Groveland, FL R+23
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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.