Norco leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 64% of adults in Norco typically vote, near the U.S. average of about 62%. Among adults in Norco, ~25% vote Democratic, ~38% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How Norco compares
Among cities within 25 miles, Norco leans more Republican than 78 of 85 neighbors.
Norco runs about 40 points more Republican than California as a whole. California leans Democratic overall, while Norco is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Norco. The northwest side is the most Republican-leaning (R+34) and the west side is the least Republican-leaning (R+5), a spread of about 29 points.
Why Norco 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 Norco, not a ranked or complete list of what matters most.
Norco votes Republican even though it is densely developed (about 85%, well above the California average of 58%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 79% of households in Norco are family households, above 88% of cities. Norco runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Norco, CA sits in the top tenth nationally on this measure.
Why turnout in Norco looks the way it does
Turnout in Norco sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Eastvale, CA Even
- Corona, CA Even
- Mira Loma, CA Even
- Pedley, CA R+4
- Glen Avon, CA D+4
- Riverside, CA Even
- Chino, CA Even
- Rubidoux, CA D+9
- Ontario, CA D+13
- Chino Hills, CA R+4
Cities with Similar Populations
- Carbondale, IL D+36
- Ardmore, OK R+33
- Klamath Falls, OR R+22
- Bristol, VA R+43
- Wasco, CA Even
- Madison Heights, MI D+9
- Martinsville, IN R+52
- Richmond Hill, GA R+27
- Monroeville, PA D+20
- Rolla, MO R+22
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.