Marlborough leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican. These figures are model estimates: New Hampshire did not have precinct-level voting records available for training, so the numbers above come from demographic and health features rather than local ground truth.
About 74% of adults in Marlborough typically vote, above the U.S. average of about 62%. Among adults in Marlborough, ~34% vote Democratic, ~40% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Marlborough compares
Among cities within 25 miles, Marlborough leans more Republican than 54 of 102 neighbors.
Marlborough runs about 11 points more Republican than New Hampshire as a whole.
Why Marlborough leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Marlborough. None of them point strongly toward either party.
Local retail density and voter turnout
Places with dense local retail within a mile tend to turn out at a higher rate; Marlborough, NH sits in the top tenth nationally on this measure. Nearby retail does not change how people vote; it reflects how urban and built-up a place is.
Why turnout in Marlborough looks the way it does
Turnout in Marlborough sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- North Swanzey, NH R+9
- Troy, NH R+12
- Swanzey, NH R+16
- Keene, NH D+22
- Harrisville, NH D+13
- Sullivan, NH D+4
- West Swanzey, NH R+11
- Nelson, NH D+6
- Dublin, NH D+7
- Munsonville, NH D+4
Cities with Similar Populations
- Carnegie, OK R+63
- Cattaraugus, NY R+46
- Warren, MN R+53
- Park City, MT R+66
- Meansville, GA R+76
- Capron, VA R+9
- Jeromesville, OH R+61
- New Fairview, TX R+68
- Horton, KS R+35
- Wellington, NV R+47
Sources and methodology
Precinct-level voting records used to fit the model come from New Hampshire Secretary of State, Elections Division, 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. NH did not have precinct-level voting records available for training, so the figures here come from extrapolation across demographic, health, and land-use features rather than local ground truth. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.