Jefferson Parish is a true toss-up. About 52% of voters here vote Democratic and 48% Republican.
About 59% of adults in Jefferson Parish typically vote, near the U.S. average of about 62%. Among adults in Jefferson Parish, ~31% vote Democratic, ~28% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Jefferson Parish compares
Among counties within 50 miles, Jefferson Parish leans more Democratic than 8 of 10 neighbors.
Jefferson Parish runs about 26 points more Democratic than Louisiana as a whole. Louisiana leans Republican overall, while Jefferson Parish is one of the few Democratic-leaning pockets.
Politics vary noticeably by city within Jefferson Parish. The east side runs the most Democratic (D+26) and the northwest side runs the most Republican (R+7), a spread of about 33 points.
Why Jefferson Parish 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 Jefferson Parish, not a ranked or complete list of what matters most.
Jefferson Parish votes against the grain of Louisiana. Louisiana leans Republican overall, while Jefferson Parish runs about 26 points more Democratic.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Jefferson Parish, LA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Jefferson Parish looks the way it does
Renters vote less often than owners. About 35% of households in Jefferson Parish rent, about 10 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 22% of adults in Jefferson Parish report food insecurity, above 83% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Orleans Parish, LA D+63
- St. Bernard Parish, LA R+14
- St. Charles Parish, LA R+25
- Plaquemines Parish, LA R+27
- St. John the Baptist Parish, LA D+27
- St. Tammany Parish, LA R+35
- Lafourche Parish, LA R+55
- St. James Parish, LA D+3
- Terrebonne Parish, LA R+42
- Tangipahoa Parish, LA R+31
Counties with Similar Populations
- Dakota County, MN D+11
- Monterey County, CA D+29
- Sarasota County, FL R+17
- Santa Barbara County, CA D+26
- Lucas County, OH D+17
- Berks County, PA R+8
- Solano County, CA D+21
- Pinal County, AZ R+16
- York County, PA R+21
- East Baton Rouge Parish, LA D+23
Sources and methodology
Precinct-level voting records used to fit the model come from Louisiana Secretary of State, 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.