WordNet (r) 3.0 (2006):

Casper
    n 1: a city of east central Wyoming on the North Platte river

U.S. Gazetteer Places (2000):

Casper, WY -- U.S. city in Wyoming
   Population (2000):    49644
   Housing Units (2000): 21872
   Land area (2000):     23.945576 sq. miles (62.018754 sq. km)
   Water area (2000):    0.315842 sq. miles (0.818028 sq. km)
   Total area (2000):    24.261418 sq. miles (62.836782 sq. km)
   FIPS code:            13150
   Located within:       Wyoming (WY), FIPS 56
   Location:             42.834665 N, 106.325062 W
   ZIP Codes (1990):     82601 82604 82609
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Casper, WY
    Casper