Castine leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican. These figures are model estimates: Maine 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 73% of adults in Castine typically vote, above the U.S. average of about 62%. Among adults in Castine, ~49% vote Democratic, ~24% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How Castine compares
Among cities within 25 miles, Castine leans more Democratic than 75 of 79 neighbors.
Castine runs about 26 points more Democratic than Maine as a whole.
Why Castine 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 Castine, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 74% of adults in Castine hold a bachelor's degree, about 46 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 56% of adults in Castine have never been married, in the top fraction of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Castine, ME sits above the national average on this measure.
Why turnout in Castine looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Castine 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 66%, about 6 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and more than 99% of adults in Castine have completed high school, in the top fraction of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- West Brooksville, ME D+22
- Harborside, ME D+23
- West Penobscot, ME Even
- Brooksville, ME D+22
- South Penobscot, ME D+9
- Penobscot, ME D+7
- Islesboro, ME D+28
- Stockton Springs, ME R+14
- Sedgwick, ME D+13
Cities with Similar Populations
- Yettem, CA R+17
- Stites, ID R+69
- St. Elmo, MI R+42
- Centerton, NJ R+31
- Phillipsburg, OH R+55
- Hiram, ME R+29
- Lincoln, MI R+39
- Ama, LA R+9
- Ossian, IA R+38
- Joliet, MT R+57
Sources and methodology
Precinct-level voting records used to fit the model come from Maine Secretary of State, Bureau of Corporations Elections and Commissions, 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. ME 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.