Capitol Hill is a Democratic stronghold. About 89% of voters here vote Democratic and 11% Republican.
About 68% of adults in Capitol Hill typically vote, above the U.S. average of about 62%. Among adults in Capitol Hill, ~60% vote Democratic, ~8% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Capitol Hill compares
Among neighborhoods within 5 miles, Capitol Hill leans more Democratic than 17 of 41 neighbors.
Capitol Hill runs about 7 points more Republican than the District of Columbia as a whole.
Politics vary noticeably by block within Capitol Hill. The northeast side is the most Democratic-leaning (D+86) and the southwest side is the least Democratic-leaning (D+63), a spread of about 24 points.
Why Capitol Hill leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Capitol Hill, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 78% of adults in Capitol Hill hold a bachelor's degree, about 49 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 56% of adults in Capitol Hill have never been married, above 89% of neighborhoods.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Capitol Hill, Washington, DC sits in the top tenth nationally on this measure.
Why turnout in Capitol Hill looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Capitol Hill 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%. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Stanton Park, Washington, DC D+84
- Lincoln Park, Washington, DC D+84
- Hill East, Washington, DC D+80
- Stadium-Armory, Washington, DC D+85
- Mt Vernon Square, Washington, DC D+74
- South West, Washington, DC D+76
- Downtown, Washington, DC D+71
- Shaw, Washington, DC D+84
- Fairlawn, Washington, DC D+86
- Brentwood, Washington, DC D+83
Neighborhoods with Similar Populations
- Richmond, Philadelphia, PA D+24
- Auburndale, Queens, NY R+2
- Carmel Valley, San Diego, CA D+29
- Greater Memorial, Houston, TX R+14
- Dyker Heights, Brooklyn, NY R+20
- Woodhaven, Queens, NY D+9
- South Dorchester, Boston, MA D+57
- Fenway-Kenmore, Boston, MA D+67
- Mission, San Francisco, CA D+72
- New Brighton, Staten Island, NY D+36
Sources and methodology
Precinct-level voting records used to fit the model come from District of Columbia Board of 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.