Duncanville, TX Political Map | Democrat & Republican Areas in Duncanville

By the BestNeighborhood data science team. Last updated May 2026.

Duncanville leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.

 

About 50% of adults in Duncanville typically vote, below the U.S. average of about 62%. Among adults in Duncanville, ~33% vote Democratic, ~16% Republican, and ~51% don't vote. The map below shows estimated turnout by block group.

How Duncanville compares

Among cities within 25 miles, Duncanville leans more Democratic than 53 of 59 neighbors.

Duncanville runs about 47 points more Democratic than Texas as a whole. Texas leans Republican overall, while Duncanville is one of the few Democratic-leaning pockets.

Politics vary noticeably by neighborhood within Duncanville. The southeast side is the most Democratic-leaning (D+50) and the northwest side is the least Democratic-leaning (D+22), a spread of about 27 points.

Why Duncanville 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 Duncanville, not a ranked or complete list of what matters most.

Dense areas vote Democratic. About 96% of residents in Duncanville live in densely developed areas, about 59 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 39% of adults in Duncanville have never been married, above 93% of cities. Duncanville runs against the grain of Texas, a Democratic-leaning pocket in a Republican-leaning state.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Duncanville, TX sits in the top tenth 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 Duncanville looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Duncanville is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 23%, about 13 points above the U.S. average of 10%. Renters vote less often than owners, and about 37% of households in Duncanville rent, above 92% of cities. Learn more about the findings and methodology on the political spectrum map.

Sources and methodology

Precinct-level voting records used to fit the model come from Texas Secretary of State, Elections Division, 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.