Hawaii County, HI Political Map | Democrat & Republican Areas in Hawaii County

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

Hawaii County leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.

 

About 58% of adults in Hawaii County typically vote, near the U.S. average of about 62%. Among adults in Hawaii County, ~35% vote Democratic, ~23% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.

How Hawaii County compares

Politically, Hawaii County sits close to the rest of Hawaii.

Politics vary noticeably by city within Hawaii County. The northeast side is the most Democratic-leaning (D+30) and the southwest side is the least Democratic-leaning (D+15), a spread of about 14 points.

Why Hawaii 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 Hawaii County, not a ranked or complete list of what matters most.

Areas with high college attainment vote Democratic. About 31% of adults in Hawaii County hold a bachelor's degree, above 79% of counties. A high never-married share predicts Democratic voting, and about 32% of adults in Hawaii County have never been married, above 75% of counties.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Hawaii County, HI sits above the national average on this measure.

Why turnout in Hawaii County looks the way it does

Crowded housing lines up with lower turnout. About 9% of homes in Hawaii County have more than one occupant per room, above 98% 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 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.