Rockingham County, NH Political Map | Democrat & Republican Areas in Rockingham County

By the BestNeighborhood data science team. Last updated May 2026.

Rockingham County leans slightly Democratic by roughly 6 points: about 53% of voters vote Democratic and 47% 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 85% of adults in Rockingham County typically vote, above the U.S. average of about 62%. Among adults in Rockingham County, ~45% vote Democratic, ~40% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.

How Rockingham County compares

Among counties within 50 miles, Rockingham County leans more Democratic than 3 of 8 neighbors.

Politically, Rockingham County sits close to the rest of New Hampshire.

Politics vary noticeably by city within Rockingham County. The northeast side runs the most Democratic (D+31) and the northwest side runs the most Republican (R+10), a spread of about 41 points.

Why Rockingham County leans the way it does

This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Rockingham County, not a ranked or complete list of what matters most.

Areas with high college attainment vote Democratic. About 46% of adults in Rockingham County hold a bachelor's degree, about 18 points above the U.S. average of 28%.

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Rockingham County, NH 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 Rockingham County looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Rockingham County 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 72%, about 12 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 81% of households in Rockingham County own their home, above 82% of counties. High high-school completion lines up with higher turnout, and about 96% of adults in Rockingham County have completed high school, above 97% of counties. Learn more about the findings and methodology on the political spectrum map.

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.