Town guide
Union
A township of 80 people in Day County, South Dakota
From your neighbors
What’s happening
Weather
Forecast →Coming up
Upcoming events
Nothing on the calendar yet
Add an event →Put the next local happening — a market, a meeting, a concert — on the map.
Around town
All news →Local news
Headlines via Google News · Articles belong to their publishers.
The Union album
0 of 12 shotsNeighbors document Union together
Outdoors in Union
Parks & trails →Conserved land8.9%2,014 of 22,687 acres
Trails2.8 mi0.1 mi per sq mi
Parks & preserves1named on the map
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
Town numbers
ZIP codeSign in to add
Area codeSign in to add
Living in Union
Health in Union
Compared with South Dakota
2better than SD·8worse
of 26 measures CDC estimates. The other 16 are too close to call.
BetterToo close to callWorse
What stands out
Care nearby
Sanford Hospital Webster - CahWebster · 15 mi · ER · rural critical access
Horizon Health - AberdeenAberdeen · 32.9 mi · sliding-scale fees
Primary careShortage · county-wide
DentalShortage · county-wide
Mental healthShortage · county-wide
CDC PLACES 2025 · modeled estimates for adults · ZIP codes 57468, 57219, 57422 · CMS · HRSAHealth in Union →
Natural hazards in Union
Very low
Expected storm and flood damage is higher than in 18% of U.S. communities.
🥶 Cold waves🌊 Inland flooding💨 Strong wind
FEMA National Risk Index December 2025 · OpenFEMANatural hazards in Union →
Climate in Union
Full climate →Union has cold, snowy winters and pleasant summers. A typical July afternoon reaches 81°, a January night drops to 3°, and about 43 inches of snow falls in a normal winter.
23° / 6°Winter
52° / 32°Spring
79° / 58°Summer
55° / 35°Fall
NOAA U.S. Climate Normals, 1991–2020Climate in Union →
Libraries near Union
See all →Nearest: Langford Public LibraryLangford · 10.6 miles · 18 hrs a week
Where Union is
Explore map →Imported town boundary
South Dakota · SD · Day CountyTown boundary on OpenStreetMap →
Around town
Explore map →Bordering towns
How things work in Union
All explainers →No one has written Union’s explainers yetKnow how one of these works here? Each explainer earns +10 karma.