Dartmouth leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.
About 94% of adults in Dartmouth typically vote, above the U.S. average of about 62%. Among adults in Dartmouth, ~41% vote Democratic, ~53% Republican, and ~6% don't vote. The map below shows estimated turnout by block group.
How Dartmouth compares
Among cities within 25 miles, Dartmouth leans more Republican than 77 of 94 neighbors.
Dartmouth runs about 37 points more Republican than Massachusetts as a whole. Massachusetts leans Democratic overall, while Dartmouth is one of the few Republican-leaning pockets.
Why Dartmouth 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 Dartmouth, not a ranked or complete list of what matters most.
Dartmouth votes against the grain of Massachusetts. Massachusetts leans Democratic overall, while Dartmouth runs about 37 points more Republican. A high family-household share predicts Republican voting, and about 75% of households in Dartmouth are family households, above 76% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Dartmouth, 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 Dartmouth looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Dartmouth 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 75%, about 15 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 95% of households in Dartmouth own their home, compared to around 75% in nearby cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- North Dartmouth, MA R+4
- Smith Mills, MA R+5
- Head of Westport, MA R+5
- New Bedford, MA D+8
- North Westport, MA R+18
- South Dartmouth, MA D+8
- Westport, MA R+10
- South Westport, MA D+3
- Fairhaven, MA R+3
Cities with Similar Populations
- Adams, KY R+71
- Hudson, SD R+52
- Millsboro, PA R+35
- North Lake, MI R+28
- Bosworth, MO R+69
- Mecklenburg, NY D+3
- Mills, KY R+75
- Westhope, ND R+64
- Nicasio, CA D+47
- Colmar, KY R+77
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.