WordNet (r) 3.0 (2006):

Sioux City
    n 1: a city in northeastern Iowa where the Big Sioux River joins
         the Missouri

U.S. Gazetteer Places (2000):

Sioux City, IA -- U.S. city in Iowa
   Population (2000):    85013
   Housing Units (2000): 33816
   Land area (2000):     54.800987 sq. miles (141.933899 sq. km)
   Water area (2000):    1.147167 sq. miles (2.971150 sq. km)
   Total area (2000):    55.948154 sq. miles (144.905049 sq. km)
   FIPS code:            73335
   Located within:       Iowa (IA), FIPS 19
   Location:             42.497957 N, 96.395705 W
   ZIP Codes (1990):     51101 51103 51104 51105 51106 51107
                         51108 51109 51110 51111
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Sioux City, IA
    Sioux City