Harvey is a Democratic stronghold. About 84% of voters here vote Democratic and 16% Republican.
About 47% of adults in Harvey typically vote, below the U.S. average of about 62%. Among adults in Harvey, ~39% vote Democratic, ~8% Republican, and ~53% don't vote. The map below shows estimated turnout by block group.
How Harvey compares
Among cities within 25 miles, Harvey leans more Democratic than 116 of 140 neighbors.
Harvey runs about 57 points more Democratic than Illinois as a whole.
Politics vary noticeably by neighborhood within Harvey. The northeast side is the most Democratic-leaning (D+80) and the southeast side is the least Democratic-leaning (D+44), a spread of about 35 points.
Why Harvey 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 Harvey, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 99% of residents in Harvey live in densely developed areas, about 62 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 49% of adults in Harvey have never been married, above 98% of cities.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; Harvey, IL sits in the bottom tenth 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 Harvey looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Harvey is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 45%, about 18 points below the Illinois average of 63%. Renters vote less often than owners, and about 40% of households in Harvey rent, above 94% of cities. High food insecurity lines up with lower turnout, and about 41% of adults in Harvey report food insecurity, in the top fraction of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Phoenix, IL D+81
- Dixmoor, IL D+53
- Markham, IL D+72
- Posen, IL D+33
- East Hazel Crest, IL D+65
- Riverdale, IL D+80
- Dolton, IL D+82
- South Holland, IL D+77
- Hazel Crest, IL D+80
- Thornton, IL D+28
Cities with Similar Populations
- Brigham City, UT R+40
- Madison, IN R+39
- Deridder, LA R+58
- Wixom, MI D+12
- Mayfield Heights, OH D+21
- Germantown, WI R+13
- Iselin, NJ D+2
- Connersville, IN R+53
- Canton, MS D+47
- Westbury, NY D+16
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Sources and methodology
Precinct-level voting records used to fit the model come from Illinois State Board of 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.