Union’s story
Union in pictures
1 places on the National Register of Historic Places.
Explore the history →UnionSD
A town of 18.
Population
18
residents
Household income
$56K
median
Median age
71.3
years
Small town
18 people, and everyone knows the way
In a town this size, neighbors are the best guide. Ask them anything.
Nearby towns
DudleyMount VernonLisbonBakerUnion
Union’s report card
Now in Union
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The data
Ordered by what stands out in Union. Another town gets a different order.
Climate
Snowy winters, pleasant summers
Union has cold, snowy winters and warm summers. A typical July afternoon reaches 87°, a January night drops to 8°, and about 41 inches of snow falls in a normal winter.
41″snow a winter
Typical low → high °F
Winter11–31°
Spring34–58°
Summer59–84°
Fall37–61°
Oct 11
typical first frost
Apr 27
typical last frost
+0.8°
vs. the 20th-century average
NOAA U.S. Climate Normals, 1991–2020Full climate →
Health
How healthy Union is
Union tracks South Dakota closely on all 26 CDC measures.
26 measures vs. South Dakota
0 better26 too close to call0 worse
Avera Queen of Peace
13.4 mi away · emergency room
3 of 3
care shortages: primary care, dental, mental health
CDC PLACES 2025 · modeled estimates for adults · CMS · HRSAFull health report →
Outdoors
6.6% of Union is conserved land
2.9 miles of trails across 0 parks and preserves.
6.6%conserved
6.6%
conserved · 1,522 of 23,017 acres
2.9 mi
of trails · 0.1 per sq mi
Trails & parks © OpenStreetMap contributors · Conserved land: USGS PAD-USParks & trails →
Natural hazards
Moderate risk, with inland flooding at the top
Expected storm and flood damage is higher than in 49% of U.S. communities.
49risk score of 100
FEMA risk score
Inland floodingTornadoesCold waves
FEMA National Risk Index · OpenFEMANatural hazards →