Simi Valley, CA Political Map | Democrat & Republican Areas in Simi Valley

By the BestNeighborhood data science team. Last updated May 2026.

Simi Valley is a true toss-up. About 49% of voters here vote Democratic and 51% Republican.

 

About 71% of adults in Simi Valley typically vote, above the U.S. average of about 62%. Among adults in Simi Valley, ~35% vote Democratic, ~36% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.

How Simi Valley compares

Among cities within 25 miles, Simi Valley sits roughly in the middle of the political spectrum, with 52 neighbors leaning further in the place's direction and 8 leaning the other way.

Simi Valley runs about 22 points more Republican than California as a whole. California leans Democratic overall, while Simi Valley sits closer to the political middle.

Why Simi Valley 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 Simi Valley, not a ranked or complete list of what matters most.

Simi Valley votes against the grain of California. California leans Democratic overall, while Simi Valley runs about 22 points more Republican.

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Simi Valley, CA sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Simi Valley looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Simi Valley 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 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.

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.