Assumption Parish leans heavily Democratic by roughly 46 points: about 73% of voters vote Democratic and 27% Republican.
About 55% of adults in Assumption Parish typically vote, below the U.S. average of about 62%. Among adults in Assumption Parish, ~40% vote Democratic, ~15% Republican, and ~45% don't vote. The map below shows estimated turnout by block group.
How Assumption Parish compares
Among neighborhoods within 5 miles, Assumption Parish leans more Democratic than 12 of 34 neighbors.
Assumption Parish runs about 25 points more Democratic than California as a whole.
Why Assumption Parish leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Assumption Parish, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Assumption Parish live in densely developed areas, about 64 points above the U.S. average of 36%.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Assumption Parish, San Leandro, CA sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Assumption Parish looks the way it does
Crowded housing lines up with lower turnout. About 12% of homes in Assumption Parish have more than one occupant per room, above 93% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Old San Leandro, San Leandro, CA D+50
- Upper Bal, San Leandro, CA D+44
- Estudillo Estates-Glen, San Leandro, CA D+54
- Lower Bal, San Leandro, CA D+39
- Floresta Gardens-Bradrick, San Leandro, CA D+41
- Chabot Park, Oakland, CA D+67
- Durant Manor, Oakland, CA D+60
- Davis Tract, San Leandro, CA D+36
- Sobrante Park, Oakland, CA D+52
- North Stonehurst, Oakland, CA D+59
Neighborhoods with Similar Populations
- Deering, Portland, ME D+70
- Mitchell West, Milwaukee, WI D+9
- Lamberts Point, Norfolk, VA D+67
- Rosedale, Camden, NJ D+50
- Midtown, Anchorage, AK D+42
- Liberia, Hollywood, FL D+52
- Coventry, Crystal Lake, IL D+5
- The Canal on Preston, Plano, TX D+8
- Beverly Park, Hollywood, FL D+29
- Silver Valley Addition, Sioux Falls, SD R+12
Sources and methodology
Precinct-level voting records used to fit the model come from California 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.