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About Oacoma, South Dakota

Oacoma is a town in Lyman County, South Dakota, United States. The population was 451 at the 2010 census. Oacoma is located on the west bank of the Missouri River, across from Chamberlain.

News from Oacoma

Oacoma Facts

  • Population Total: 451
  • Square Miles: 2
  • Area Code: 605
  • Elevation: 1385
  • Postal Codes: 57365
  • Timezone: North American Central