47904 leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 45% of adults in 47904 typically vote, below the U.S. average of about 62%. Among adults in 47904, ~26% vote Democratic, ~19% Republican, and ~55% don't vote. The map below shows estimated turnout by block group.
How 47904 compares
Among zip codes within 15 miles, 47904 leans more Democratic than 13 of 16 neighbors.
47904 runs about 32 points more Democratic than Indiana as a whole. Indiana leans Republican overall, while 47904 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 47904. The southwest side is the most Democratic-leaning (D+30) and the northeast side is the least Democratic-leaning (D+3), a spread of about 27 points.
Why 47904 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 47904, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 98% of residents in 47904 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 42% of adults in 47904 have never been married, above 89% of zip codes. 47904 runs against the grain of Indiana, a Democratic-leaning pocket in a Republican-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 47904, IN sits in the top quarter nationally on this measure.
Why turnout in 47904 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 47904 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 57% of households in 47904 rent, compared to around 37% in nearby zip codes. High-crime urban areas turn out at lower rates, and 47904 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 Indiana 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.