What is "oacoma"

Population (2000): 390
Housing Units (2000): 188
Land area (2000): 2.022935 sq. miles (5.239377 sq. km)
Water area (2000): 2.422905 sq. miles (6.275294 sq. km)
Total area (2000): 4.445840 sq. miles (11.514671 sq. km)
FIPS code: 46180
Located within: South Dakota (SD), FIPS 46
Location: 43.804117 N, 99.380157 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: