The Collaborative International Dictionary of English v.0.48:

Manito \Man"i*to\, Manitou \Man"i*tou\, Manitu \Man"i*tu\, n.
   A name given by tribes of American Indians to a great spirit,
   whether good or evil, or to any object of worship. --Tylor.
   [1913 Webster]

         Gitche Manito the mighty,
         The Great Spirit, the creator,
         Smiled upon his helpless children!       --Longfellow.
   [1913 Webster]

         Mitche Manito the mighty,
         He the dreadful Spirit of Evil,
         As a serpent was depicted.               --Longfellow.
   [1913 Webster]

U.S. Gazetteer Places (2000):

Manitou, OK -- U.S. town in Oklahoma
   Population (2000):    278
   Housing Units (2000): 111
   Land area (2000):     0.314844 sq. miles (0.815442 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.314844 sq. miles (0.815442 sq. km)
   FIPS code:            46150
   Located within:       Oklahoma (OK), FIPS 40
   Location:             34.507930 N, 98.980859 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Manitou, OK
    Manitou