Diamond Head-Kapahulu-St Louis leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 48% of adults in Diamond Head-Kapahulu-St Louis typically vote, below the U.S. average of about 62%. Among adults in Diamond Head-Kapahulu-St Louis, ~32% vote Democratic, ~15% Republican, and ~53% don't vote. The map below shows estimated turnout by block group.
How Diamond Head-Kapahulu-St Louis compares
Among neighborhoods within 5 miles, Diamond Head-Kapahulu-St Louis leans more Democratic than 12 of 13 neighbors.
Diamond Head-Kapahulu-St Louis runs about 13 points more Democratic than Hawaii as a whole.
Politics vary noticeably by block within Diamond Head-Kapahulu-St Louis. The southwest side is the most Democratic-leaning (D+49) and the southeast side is the least Democratic-leaning (D+25), a spread of about 24 points.
Why Diamond Head-Kapahulu-St Louis leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Diamond Head-Kapahulu-St Louis. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Diamond Head-Kapahulu-St Louis, Honolulu, HI sits in the top quarter 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 Diamond Head-Kapahulu-St Louis looks the way it does
Crowded housing lines up with lower turnout. About 8% of homes in Diamond Head-Kapahulu-St Louis have more than one occupant per room, above 86% of neighborhoods. Strong routine healthcare access lines up with higher turnout, and Diamond Head-Kapahulu-St Louis sits in the top quarter on routine-care measures. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Kaimuki, Honolulu, HI D+32
- Waikiki, Honolulu, HI D+32
- Mxcully-Moiliili, Honolulu, HI D+34
- Palolo, Honolulu, HI D+25
- Manoa, Honolulu, HI D+44
- Waialae-Kahala, Honolulu, HI D+27
- Makiki, Honolulu, HI D+34
- Ala Moana-Kakaako, Honolulu, HI D+31
- Nuuanu-Punchbowl, Honolulu, HI D+31
- Downtown, Honolulu, HI D+33
Neighborhoods with Similar Populations
- South Natomas, Sacramento, CA D+37
- Lower West Side, Chicago, IL D+58
- North Central Omaha, Omaha, NE D+24
- North Gateway, Phoenix, AZ R+14
- Kalihi Valley, Honolulu, HI D+11
- West Baltimore, Baltimore, MD D+82
- Central, Tacoma, WA D+52
- Central Arlington, Arlington, TX D+25
- Mililani Mauka-Launani Valley, Mililani, HI D+16
- San Luis Rey, Oceanside, CA D+11
All Local Stats
Home Services
Sources and methodology
Precinct-level voting records used to fit the model come from Hawaii Office 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. Some land-use inputs for Hawaii, including walkability and the environmental-justice index, are estimated rather than measured, so the figures here carry added uncertainty. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.