The Collaborative International Dictionary of English v.0.48:

pampa \pam"pa\, n.
   A plain. See pampas.
   [PJC]

U.S. Gazetteer Places (2000):

Pampa, TX -- U.S. city in Texas
   Population (2000):    17887
   Housing Units (2000): 8785
   Land area (2000):     8.725278 sq. miles (22.598365 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    8.725278 sq. miles (22.598365 sq. km)
   FIPS code:            54912
   Located within:       Texas (TX), FIPS 48
   Location:             35.543005 N, 100.964744 W
   ZIP Codes (1990):     79065
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Pampa, TX
    Pampa