Miami-Dade County leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 55% of adults in Miami-Dade County typically vote, below the U.S. average of about 62%. Among adults in Miami-Dade County, ~25% vote Democratic, ~30% Republican, and ~45% don't vote. The map below shows estimated turnout by block group.
How Miami-Dade County compares
Miami-Dade County runs about 5 points more Democratic than Florida as a whole.
Politics vary noticeably by city within Miami-Dade County. The northeast side runs the most Democratic (D+29) and the west side runs the most Republican (R+35), a spread of about 64 points.
Why Miami-Dade County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Miami-Dade County, not a ranked or complete list of what matters most.
Miami-Dade County votes Republican even though it is densely developed (about 93%, far 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 71% of households in Miami-Dade County are family households, above 83% of counties.
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as Miami-Dade County, FL does.
Why turnout in Miami-Dade County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Miami-Dade County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 26%, about 11 points above the Florida average of 15%. Renters vote less often than owners, and about 44% of households in Miami-Dade County rent, compared to around 26% in nearby counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Broward County, FL D+20
- Palm Beach County, FL D+5
- Hendry County, FL R+26
- Collier County, FL R+20
- Monroe County, FL R+15
- Martin County, FL R+25
- Glades County, FL R+47
- St. Lucie County, FL R+5
- Okeechobee County, FL R+46
- Lee County, FL R+19
Counties with Similar Populations
- Kings County, NY D+34
- Dallas County, TX D+27
- Riverside County, CA Even
- Queens County, NY D+23
- King County, WA D+45
- Clark County, NV D+12
- Orange County, CA D+6
- San Bernardino County, CA Even
- Tarrant County, TX D+3
- San Diego County, CA D+17
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.