Seffner leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.
About 68% of adults in Seffner typically vote, above the U.S. average of about 62%. Among adults in Seffner, ~30% vote Democratic, ~38% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Seffner compares
Among cities within 25 miles, Seffner leans more Republican than 21 of 58 neighbors.
Politically, Seffner sits close to the rest of Florida.
Politics vary noticeably by neighborhood within Seffner. The east side is the most Republican-leaning (R+21) and the west side is the least Republican-leaning (R+6), a spread of about 15 points.
Why Seffner 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 Seffner, not a ranked or complete list of what matters most.
Seffner votes Republican even though it is densely developed (about 70%, modestly 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 75% of households in Seffner are family households, above 77% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Seffner, FL sits in the top tenth nationally on this measure.
Why turnout in Seffner looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Seffner is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Mango, FL R+3
- Dover, FL R+32
- Brandon, FL Even
- Valrico, FL R+15
- East Lake-Orient Park, FL D+35
- Thonotosassa, FL R+9
- Temple Terrace, FL D+20
- Palm River-Clair Mel, FL D+10
- Durant, FL R+31
- Bloomingdale, FL R+15
Cities with Similar Populations
- Elmwood Park, NJ R+7
- Rocky River, OH D+21
- Shafter, CA R+11
- Agoura Hills, CA D+18
- Lumberton, TX R+70
- Westerly, RI D+7
- Arnold, MD D+10
- Palm Valley, FL R+23
- Stephens City, VA R+21
- Smithfield, NC R+14
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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.