South Sioux City is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.
About 55% of adults in South Sioux City typically vote, below the U.S. average of about 62%. Among adults in South Sioux City, ~27% vote Democratic, ~29% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How South Sioux City compares
Among cities within 25 miles, South Sioux City leans more Republican than 4 of 37 neighbors.
South Sioux City runs about 17 points more Democratic than Nebraska as a whole.
Politics vary noticeably by neighborhood within South Sioux City. The northeast side runs the most Democratic (D+11) and the southwest side runs the most Republican (R+35), a spread of about 46 points.
Why South Sioux City leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in South Sioux City. The lean here lands roughly where demographic data alone would predict.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; South Sioux City, NE sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in South Sioux City looks the way it does
Areas with limited routine healthcare access turn out at lower rates. South Sioux City 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 40% of households in South Sioux City rent, compared to around 24% in nearby cities. High food insecurity lines up with lower turnout, and about 21% of adults in South Sioux City report food insecurity, above 84% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Sioux City, IA R+3
- Dakota City, NE R+40
- North Sioux City, SD R+38
- Sergeant Bluff, IA R+30
- Jackson, NE R+54
- Homer, NE R+53
- Jefferson, SD R+52
- Willis, NE R+54
- Bronson, IA R+51
- Hubbard, NE R+55
Cities with Similar Populations
- Grandview, WA Even
- Druid Hills, GA D+61
- Fruitland Park, FL R+35
- Rutherfordton, NC R+46
- Rathdrum, ID R+59
- Casa de Oro-Mount Helix, CA D+11
- New Ulm, MN R+28
- Alachua, FL R+13
- New Cumberland, PA R+9
- Trenton, OH R+52
Sources and methodology
Precinct-level voting records used to fit the model come from Nebraska 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.