Town guide
Big Sioux
A township of 4,917 people in Union County, South Dakota
From your neighbors
What’s happening
Weather
Forecast →Coming up
Upcoming events
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Around town
All news →Local news
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The Big Sioux album
0 of 12 shotsNeighbors document Big Sioux together
Outdoors in Big Sioux
Parks & trails →Conserved land19%1,457 of 7,745 acres
Trails22 mi1.9 mi per sq mi
Parks & preserves2296 conserved acres per 1,000 residents
Know a trail or park that’s missing? Anyone can add it to OpenStreetMap, and it shows up here on the next refresh.
Trails & parks © OpenStreetMap contributors · Conserved land: USGS PAD-US
How Big Sioux ranks
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Living in Big Sioux
Health in Big Sioux
A
Health Grade A
Healthier than 91% of U.S. towns on seven CDC estimates.
Compared with South Dakota
13better than SD
of 26 measures CDC estimates. The other 13 are too close to call.
BetterToo close to callWorse
What stands out
Care nearby
St. Lukes Regional Medical CenterSioux City · 5.3 mi · ER
Siouxland Community Health Women's ClinicSioux City · 5.5 mi · sliding-scale fees
Primary careNo shortage
DentalNo shortage
Mental healthShortage · county-wide
CDC PLACES 2025 · modeled estimates for adults · ZIP code 57049 · CMS · HRSAHealth in Big Sioux →
Natural hazards in Big Sioux
Very high
Expected storm and flood damage is higher than in 86% of U.S. communities.
🌊 Inland flooding🌪️ Tornadoes
FEMA National Risk Index December 2025 · OpenFEMANatural hazards in Big Sioux →
Where Big Sioux is
Explore map →Imported town boundary
South Dakota · SD · Union CountyTown boundary on OpenStreetMap →
Around town
Explore map →Bordering towns
How things work in Big Sioux
All explainers →No one has written Big Sioux’s explainers yetKnow how one of these works here? Each explainer earns +10 karma.