Groton leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 87% of adults in Groton typically vote, above the U.S. average of about 62%. Among adults in Groton, ~53% vote Democratic, ~34% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How Groton compares
Among cities within 25 miles, Groton leans more Democratic than 85 of 128 neighbors.
Politically, Groton sits close to the rest of Massachusetts.
Why Groton 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 Groton, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 70% of adults in Groton hold a bachelor's degree, about 42 points above the U.S. average of 28%.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Groton, MA sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Groton looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Groton 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 97% of adults in Groton have completed high school, above 92% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Ayer, MA D+20
- Shirley Center, MA D+9
- Graniteville, MA D+18
- Pepperell, MA D+2
- Dunstable, MA D+4
- Townsend Harbor, MA D+7
- Littleton, MA D+18
- Westford, MA D+25
- Devens, MA D+7
- Shirley, MA D+12
Cities with Similar Populations
- Fort Salonga, NY R+16
- Middlesex, NC R+31
- St. Stephens, NC R+28
- South Yarmouth, MA D+19
- Southside, AL R+75
- Adkins, TX R+47
- Naranja, FL D+12
- Willoughby Hills, OH D+14
- Good Hope, CA D+4
- Golden Valley, AZ R+53
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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.