The Collaborative International Dictionary of English v.0.48:

Avant \A*vant"\, n. [For avant-guard. Cf. Avaunt, Van.]
   The front of an army. [Obs.] See Van.
   [1913 Webster]

U.S. Gazetteer Places (2000):

Avant, OK -- U.S. town in Oklahoma
   Population (2000):    372
   Housing Units (2000): 164
   Land area (2000):     0.353989 sq. miles (0.916828 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.353989 sq. miles (0.916828 sq. km)
   FIPS code:            03500
   Located within:       Oklahoma (OK), FIPS 40
   Location:             36.488660 N, 96.061403 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Avant, OK
    Avant