47129 leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 54% of adults in 47129 typically vote, below the U.S. average of about 62%. Among adults in 47129, ~25% vote Democratic, ~29% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How 47129 compares
Among zip codes within 15 miles, 47129 leans more Republican than 32 of 42 neighbors.
47129 runs about 11 points more Democratic than Indiana as a whole.
Politics vary noticeably by block within 47129. The east side runs the most Democratic (D+2) and the northeast side runs the most Republican (R+20), a spread of about 22 points.
Why 47129 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 47129, not a ranked or complete list of what matters most.
47129 votes Republican even though it is densely developed (about 93%, far above the Indiana average of 25%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Never-married share, developed land, and voter turnout
Places that combine a never-married-heavy adult population and a heavily developed built environment tend to turn out at a lower rate, as 47129, IN does.
Why turnout in 47129 looks the way it does
Renters vote less often than owners. About 42% of households in 47129 rent, about 17 points above the U.S. average of 25%. Limited routine healthcare access lines up with lower turnout, and 47129 sits in the bottom quarter on routine-care measures. Crowded housing lines up with lower turnout, and about 4% of homes in 47129 have more than one occupant per room, above 84% of zip codes. 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.