33603 leans heavily Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.
About 56% of adults in 33603 typically vote, below the U.S. average of about 62%. Among adults in 33603, ~36% vote Democratic, ~19% Republican, and ~45% don't vote. The map below shows estimated turnout by block group.
How 33603 compares
Among zip codes within 15 miles, 33603 leans more Democratic than 41 of 45 neighbors.
33603 runs about 43 points more Democratic than Florida as a whole. Florida leans Republican overall, while 33603 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 33603. The southeast side is the most Democratic-leaning (D+57) and the northwest side is the least Democratic-leaning (D+9), a spread of about 49 points.
Why 33603 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 33603, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 97% of residents in 33603 live in densely developed areas, about 61 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 33603 sits in the top quarter (about 40%, above 80% of zip codes). 33603 runs against the grain of Florida, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 33603, 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 33603 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 33603 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 43% of households in 33603 rent, about 18 points above the U.S. average of 25%. High-crime urban areas turn out at lower rates, and 33603 sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.