Oacoma is a town in Lyman County, South Dakota, home to about 548 people across 2.6 square miles. Its ZIP code is 57365.
Homes sold for a median of $260 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 Oacoma. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Eppley Airfield (OMA)248 miles away |
|---|---|
| Closer regional airport | Pierre Regional Airport (PIR)60 miles away |
| Nearest city of 250,000+ | Omaha, NE244 miles away |
| Nearest city of 1 million+ | Chicago, IL608 miles away |
Straight-line distances from the center of Oacoma; 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.
Oacoma had 386 residents in the 2020 census, down 1% since 2000.
It’s the 144th largest of 440 towns in South Dakota by population.
Lyman County grew from 2,632 residents in 1900 to 3,718 in 2020.
Lyman County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 11°F. About 20.4 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Chamberlain Muni Ap, SD weather station (4 miles away).
621 jobs at 87 businesses in Lyman County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Grocery stores (1 nearby)
Pharmacies
Libraries
Museums
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
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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.