Marshfield leans slightly Democratic by roughly 8 points: about 54% of voters vote Democratic and 46% Republican.
About 93% of adults in Marshfield typically vote, above the U.S. average of about 62%. Among adults in Marshfield, ~50% vote Democratic, ~43% Republican, and ~7% don't vote. The map below shows estimated turnout by block group.
How Marshfield compares
Among cities within 25 miles, Marshfield leans more Democratic than 44 of 77 neighbors.
Marshfield runs about 17 points more Republican than Massachusetts as a whole.
Politics vary noticeably by neighborhood within Marshfield. The southwest side is the most Democratic-leaning (D+19) and the east side is the least Democratic-leaning (D+4), a spread of about 15 points.
Why Marshfield 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 Marshfield, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 56% of adults in Marshfield hold a bachelor's degree, about 27 points above the U.S. average of 28%. Dense areas vote Democratic, and Marshfield sits in the top fifth on density (about 42%, above 85% of cities). A high never-married share predicts Democratic voting, and about 31% of adults in Marshfield have never been married, above 77% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Marshfield, 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 Marshfield looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Marshfield 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 76%, about 16 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Ocean Bluff-Brant Rock, MA D+5
- Humarock, MA Even
- Marshfield Hills, MA D+7
- Duxbury, MA D+16
- Standish, MA D+16
- Rivermoor, MA D+16
- Pembroke, MA R+3
- Scituate, MA D+18
- Silver Lake, MA R+5
- Norwell, MA D+14
Cities with Similar Populations
- Walnut Grove, WA D+11
- White Settlement, TX R+20
- Hot Springs Village, AR R+45
- Madisonville, LA R+49
- Warwick, NY R+10
- Cadillac, MI R+24
- Bellaire, TX D+9
- Cedar Mill, OR D+48
- Mount Morris, MI D+12
- Affton, MO D+11
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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.