Jefferson is a city in Union County, South Dakota, home to about 554 people across 0.5 square miles. Its ZIP code is 57038.
Homes sold for a median of $185 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Jefferson. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Eppley Airfield (OMA)96 miles away |
|---|---|
| Closer regional airport | Sioux Gateway Airport / Brigadier General Bud Day Field (SUX)17 miles away |
| Nearest city of 250,000+ | Omaha, NE96 miles away |
| Nearest city of 1 million+ | Chicago, IL458 miles away |
Straight-line distances from the center of Jefferson; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Jefferson had 475 residents in the 2020 census, down 19% since 2000.
It’s the 143rd largest of 440 towns in South Dakota by population.
Union County grew from 11,153 residents in 1900 to 16,811 in 2020.
Union County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 9°F. About 30.4 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Sioux City Ang, IA weather station (17 miles away).
9,844 jobs at 555 businesses in Union County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
2 doctors and other health care providers list an office in Jefferson.
Nearest hospitals
Providers with an office here
| Mental health providers | 1 |
|---|---|
| Physical and occupational therapists | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.