The Collaborative International Dictionary of English v.0.48:

Chickasaws \Chick"a*saws\, n. pl.; sing. Chickasaw. (Ethnol.)
   A tribe of North American Indians (Southern Appalachian)
   allied to the Choctaws. They formerly occupied the northern
   part of Alabama and Mississippi, but now live in the Indian
   Territory.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Chickasaw
    n 1: a member of the Muskhogean people formerly living in
         northern Mississippi
    2: the Muskhogean language of the Chickasaw

U.S. Gazetteer Counties (2000):

Chickasaw -- U.S. County in Iowa
   Population (2000):    13095
   Housing Units (2000): 5593
   Land area (2000):     504.643640 sq. miles (1307.020971 sq. km)
   Water area (2000):    0.840486 sq. miles (2.176848 sq. km)
   Total area (2000):    505.484126 sq. miles (1309.197819 sq. km)
   Located within:       Iowa (IA), FIPS 19
   Location:             43.051169 N, 92.322842 W
   Headwords:
    Chickasaw
    Chickasaw, IA
    Chickasaw County
    Chickasaw County, IA


U.S. Gazetteer Counties (2000):

Chickasaw -- U.S. County in Mississippi
   Population (2000):    19440
   Housing Units (2000): 7981
   Land area (2000):     501.557583 sq. miles (1299.028121 sq. km)
   Water area (2000):    2.707568 sq. miles (7.012569 sq. km)
   Total area (2000):    504.265151 sq. miles (1306.040690 sq. km)
   Located within:       Mississippi (MS), FIPS 28
   Location:             33.934340 N, 88.937882 W
   Headwords:
    Chickasaw
    Chickasaw, MS
    Chickasaw County
    Chickasaw County, MS


U.S. Gazetteer Places (2000):

Chickasaw, OH -- U.S. village in Ohio
   Population (2000):    364
   Housing Units (2000): 139
   Land area (2000):     0.228598 sq. miles (0.592065 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.228598 sq. miles (0.592065 sq. km)
   FIPS code:            14156
   Located within:       Ohio (OH), FIPS 39
   Location:             40.436065 N, 84.493047 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Chickasaw, OH
    Chickasaw


U.S. Gazetteer Places (2000):

Chickasaw, AL -- U.S. city in Alabama
   Population (2000):    6364
   Housing Units (2000): 2989
   Land area (2000):     4.430822 sq. miles (11.475777 sq. km)
   Water area (2000):    0.143052 sq. miles (0.370502 sq. km)
   Total area (2000):    4.573874 sq. miles (11.846279 sq. km)
   FIPS code:            14392
   Located within:       Alabama (AL), FIPS 01
   Location:             30.764987 N, 88.083713 W
   ZIP Codes (1990):     36611
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Chickasaw, AL
    Chickasaw