Oacoma Map
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.
Oacoma is located at 43°48?15?N 99°22?49?W / 43.804117°N 99.380157°W / 43.804117; -99.380157.
According to the United States Census Bureau, the town has a total area of 4.4 square miles (11.5 km2). 2.0 square miles (5.2 km2) of it is land and 2.4 square miles (6.3 km2) of it (54.38%) is water.
Nearby cities include Pukwana, Reliance, Fort Thompson, Chamberlain.