66103 leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 42% of adults in 66103 typically vote, below the U.S. average of about 62%. Among adults in 66103, ~29% vote Democratic, ~13% Republican, and ~58% don't vote. The map below shows estimated turnout by block group.
How 66103 compares
Among zip codes within 15 miles, 66103 leans more Democratic than 61 of 87 neighbors.
66103 runs about 52 points more Democratic than Kansas as a whole. Kansas leans Republican overall, while 66103 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 66103. The northeast side is the most Democratic-leaning (D+51) and the west side is the least Democratic-leaning (D+14), a spread of about 37 points.
Why 66103 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 66103, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 92% of residents in 66103 live in densely developed areas, about 56 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 51% of adults in 66103 have never been married, above 95% of zip codes. 66103 runs against the grain of Kansas, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 66103, KS sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 66103 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 66103 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 58% of households in 66103 rent, about 33 points above the U.S. average of 25%. High-crime urban areas turn out at lower rates, and 66103 sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
Sources and methodology
Precinct-level voting records used to fit the model come from Kansas 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.