The Collaborative International Dictionary of English v.0.48:

Tillman \Till"man\, n.; pl. Tillmen.
   A man who tills the earth; a husbandman. [Obs.] --Tusser.
   [1913 Webster]

U.S. Gazetteer Counties (2000):

Tillman -- U.S. County in Oklahoma
   Population (2000):    9287
   Housing Units (2000): 4342
   Land area (2000):     871.965321 sq. miles (2258.379719 sq. km)
   Water area (2000):    7.245744 sq. miles (18.766389 sq. km)
   Total area (2000):    879.211065 sq. miles (2277.146108 sq. km)
   Located within:       Oklahoma (OK), FIPS 40
   Location:             34.381055 N, 98.932086 W
   Headwords:
    Tillman
    Tillman, OK
    Tillman County
    Tillman County, OK