South Hadley leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.
About 80% of adults in South Hadley typically vote, above the U.S. average of about 62%. Among adults in South Hadley, ~54% vote Democratic, ~26% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How South Hadley compares
Among cities within 25 miles, South Hadley leans more Democratic than 64 of 94 neighbors.
South Hadley runs about 9 points more Democratic than Massachusetts as a whole.
Politics vary noticeably by neighborhood within South Hadley. The northeast side is the most Democratic-leaning (D+59) and the southeast side is the least Democratic-leaning (D+23), a spread of about 36 points.
Why South Hadley 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 South Hadley, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 54% of adults in South Hadley hold a bachelor's degree, about 26 points above the U.S. average of 28%. Dense areas vote Democratic, and South Hadley sits in the top fifth on density (about 60%, above 90% of cities). A high never-married share predicts Democratic voting, and about 36% of adults in South Hadley have never been married, above 89% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; South Hadley, MA sits in the top tenth 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 South Hadley looks the way it does
Areas with strong routine healthcare access turn out at higher rates. South Hadley 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 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in South Hadley have completed high school, above 88% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Holyoke, MA D+27
- Granby, MA Even
- Chicopee, MA D+7
- Easthampton, MA D+36
- Ludlow Center, MA R+16
- Northampton, MA D+79
- Indian Orchard, MA D+25
- Southampton, MA Even
- Ludlow, MA R+10
- South Amherst, MA D+76
Cities with Similar Populations
- Fletcher, NC R+9
- Safety Harbor, FL R+6
- Greenville, OH R+49
- Dillsburg, PA R+35
- Great Falls, VA D+21
- Auburn, GA R+23
- Kings Park, NY R+26
- Larchmont, NY D+43
- Mechanicville, NY R+8
- Four Corners, OR D+5
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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.