Sebastian leans Republican by roughly 28 points: about 36% of voters vote Democratic and 64% Republican.
About 87% of adults in Sebastian typically vote, above the U.S. average of about 62%. Among adults in Sebastian, ~31% vote Democratic, ~56% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How Sebastian compares
Among cities within 25 miles, Sebastian leans more Republican than 12 of 22 neighbors.
Sebastian runs about 14 points more Republican than Florida as a whole.
Politics vary noticeably by neighborhood within Sebastian. The southwest side is the most Republican-leaning (R+33) and the east side is the least Republican-leaning (R+23), a spread of about 10 points.
Why Sebastian 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 Sebastian, not a ranked or complete list of what matters most.
Sebastian votes Republican even though it is densely developed (about 77%, well above the Florida average of 57%). Here an older population outweighs the Democratic lean that density usually predicts.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Sebastian, FL sits in the top tenth nationally on this measure.
Why turnout in Sebastian looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sebastian 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 64%, above 61% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Roseland, FL R+41
- Wabasso, FL R+33
- Orchid, FL R+28
- Micco, FL R+29
- Fellsmere, FL R+13
- Indian River Shores, FL R+22
- Gifford, FL D+22
- Vero Beach, FL R+27
- West Vero Corridor, FL R+26
- Grant-Valkaria, FL R+41
Cities with Similar Populations
- Colonial Heights, VA R+5
- Logansport, IN R+31
- Fremont, OH R+21
- Austintown, OH R+4
- Haslet, TX R+33
- Fort Dodge, IA R+15
- Dickinson, ND R+49
- Winona, MN D+9
- Lebanon, OR R+33
- Sachse, TX R+11
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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.