Harder-Tennyson leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 35% of adults in Harder-Tennyson typically vote, below the U.S. average of about 62%. Among adults in Harder-Tennyson, ~24% vote Democratic, ~11% Republican, and ~65% don't vote. The map below shows estimated turnout by block group.
How Harder-Tennyson compares
Among neighborhoods within 5 miles, Harder-Tennyson leans more Democratic than 6 of 16 neighbors.
Harder-Tennyson runs about 16 points more Democratic than California as a whole.
Why Harder-Tennyson 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 Harder-Tennyson, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Harder-Tennyson live in densely developed areas, about 64 points above the U.S. average of 36%.
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 Harder-Tennyson, Hayward, CA does.
Why turnout in Harder-Tennyson looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Harder-Tennyson is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Crowded housing lines up with lower turnout, and about 28% of homes in Harder-Tennyson have more than one occupant per room, in the top fraction of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Whitman-Mocine, Hayward, CA D+33
- Tennyson-Alquire, Hayward, CA D+35
- Southgate, Hayward, CA D+39
- Jackson Triangle, Hayward, CA D+38
- Glen Eden, Hayward, CA D+33
- Mission-Garin, Hayward, CA D+43
- Mission-Foothill, Hayward, CA D+43
- Santa Clara Street, Hayward, CA D+39
- Mt Eden, Hayward, CA D+30
- Burbank-Hayward, Hayward, CA D+42
Neighborhoods with Similar Populations
- Hunting Park, Philadelphia, PA D+64
- Wicker Park, Chicago, IL D+71
- Canyon Crest, Riverside, CA D+10
- Sheep Mountain, Las Vegas, NV R+12
- Mount Greenwood, Chicago, IL R+26
- Richmond, Portland, OR D+87
- Sunrise, Las Vegas, NV D+26
- Taylor Ranch, Albuquerque, NM D+15
- Southwest, Columbus, OH Even
- Bronxdale, Bronx, NY D+31
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.