Marco Island leans heavily Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 84% of adults in Marco Island typically vote, above the U.S. average of about 62%. Among adults in Marco Island, ~29% vote Democratic, ~55% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Marco Island compares
Among cities within 25 miles, Marco Island leans more Republican than 3 of 9 neighbors.
Marco Island runs about 18 points more Republican than Florida as a whole.
Why Marco Island 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 Marco Island, not a ranked or complete list of what matters most.
Marco Island votes Republican even though it is densely developed (about 61%, about 24 points above the U.S. average of 36%). Here an older population outweighs the Democratic lean that density usually predicts.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Marco Island, FL sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Marco Island looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Marco Island 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 97% of adults in Marco Island have completed high school, above 87% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Goodland, FL R+37
- Copeland, FL R+55
- Golden Gate, FL R+4
- Naples, FL R+24
- Everglades, FL R+57
- Jerome, FL R+55
- Naples Park, FL R+20
- Chokoloskee, FL R+61
- Bonita Springs, FL R+24
Cities with Similar Populations
- Glenmont, MD D+51
- Chesnee, SC R+60
- Las Vegas, NM D+29
- North Reading, MA D+9
- Fairview Heights, IL D+18
- Gilbertsville, PA R+14
- Sayville, NY R+18
- Grand Ledge, MI R+4
- Eureka, MO R+25
- Wauconda, IL Even
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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.