Key Biscayne, FL Political Map | Democrat & Republican Areas in Key Biscayne

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

Key Biscayne leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.

 

About 73% of adults in Key Biscayne typically vote, above the U.S. average of about 62%. Among adults in Key Biscayne, ~32% vote Democratic, ~41% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.

How Key Biscayne compares

Among cities within 25 miles, Key Biscayne leans more Republican than 40 of 75 neighbors.

Politically, Key Biscayne sits close to the rest of Florida.

Why Key Biscayne 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 Key Biscayne, not a ranked or complete list of what matters most.

Key Biscayne votes Republican even though it is densely developed (about 94%, far above the Florida average of 57%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 80% of households in Key Biscayne are family households, above 89% of cities.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Key Biscayne, FL sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.

Why turnout in Key Biscayne looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Key Biscayne 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 71%, about 11 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Key Biscayne have completed high school, above 85% of cities. Learn more about the findings and methodology on the political spectrum map.

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Sources and methodology

Precinct-level voting records used to fit the model come from Florida Division 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.