Sanibel leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 83% of adults in Sanibel typically vote, above the U.S. average of about 62%. Among adults in Sanibel, ~31% vote Democratic, ~53% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Sanibel compares
Among cities within 25 miles, Sanibel leans more Republican than 11 of 20 neighbors.
Sanibel runs about 12 points more Republican than Florida as a whole.
Politics vary noticeably by neighborhood within Sanibel. The northwest side is the most Republican-leaning (R+34) and the west side is the least Republican-leaning (R+18), a spread of about 16 points.
Why Sanibel 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 Sanibel, not a ranked or complete list of what matters most.
Sanibel votes Republican even though it is densely developed (about 37%, well below the Florida average of 57%). Here an older population outweighs the Democratic lean that density usually predicts.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as Sanibel, FL does.
Why turnout in Sanibel looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sanibel 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 74%, about 14 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in Sanibel own their home, about 17 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and more than 99% of adults in Sanibel have completed high school, in the top fraction of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- St. James City, FL R+41
- Iona, FL R+25
- Captiva, FL R+34
- Fort Myers Beach, FL R+29
- Cypress Lake, FL R+19
- McGregor, FL R+21
- Cape Coral, FL R+29
- Whiskey Creek, FL R+22
- Coconut, FL R+37
Cities with Similar Populations
- Red Oak, IA R+37
- New Martinsville, WV R+49
- West Salem, OH R+57
- Annandale, NJ Even
- Huntington Woods, MI D+47
- Fort Wright, KY R+8
- Mount Airy, GA R+61
- Brodhead, WI R+23
- Old Town, FL R+68
- Valley View, TX R+67
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.