Somerville leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% 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 53% of adults in Somerville typically vote, below the U.S. average of about 62%. Among adults in Somerville, ~33% vote Democratic, ~20% Republican, and ~47% don't vote. The map below shows estimated turnout by block group.
How Somerville compares
Among neighborhoods within 5 miles, Somerville leans more Democratic than 8 of 12 neighbors.
Somerville runs about 23 points more Democratic than New Hampshire as a whole.
Politics vary noticeably by block within Somerville. The northwest side is the most Democratic-leaning (D+47) and the northeast side is the least Democratic-leaning (D+17), a spread of about 31 points.
Why Somerville leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Somerville. None of them point strongly toward either party.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Somerville, Manchester, NH sits in the top tenth nationally on this measure.
Why turnout in Somerville looks the way it does
Renters vote less often than owners. About 62% of households in Somerville rent, about 37 points above the U.S. average of 25%. High-crime urban areas turn out at lower rates, and Somerville sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Hallsville, Manchester, NH D+21
- Kalivas Union, Manchester, NH D+32
- Bakersville, Manchester, NH D+21
- Downtown, Manchester, NH D+44
- Highlands, Manchester, NH D+11
- Piscataquog, Manchester, NH D+24
- Straw-Smyth, Manchester, NH D+32
- Youngsville, Manchester, NH Even
- Rimmon Heights, Manchester, NH D+24
- Wellington, Manchester, NH D+21
Neighborhoods with Similar Populations
- Riverside Rancho, Glendale, CA D+38
- Terra Nova, Chula Vista, CA D+14
- The Trails, Las Vegas, NV D+9
- Midtown, Tucson, AZ D+33
- Chevy Chase, Glendale, CA D+3
- Creighton Village, Old Bridge, NJ R+24
- Clifton Heights, Louisville, KY D+44
- Whisman Station, Mountain View, CA D+45
- Old North Sacramento, Sacramento, CA D+39
- Sheldon, Mobile, AL R+13
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.