The Collaborative International Dictionary of English v.0.48:

Montross \Mon*tross"\, n.
   See Matross. [Obs.]
   [1913 Webster]

U.S. Gazetteer Places (2000):

Montross, VA -- U.S. town in Virginia
   Population (2000):    315
   Housing Units (2000): 164
   Land area (2000):     1.021257 sq. miles (2.645043 sq. km)
   Water area (2000):    0.000715 sq. miles (0.001851 sq. km)
   Total area (2000):    1.021972 sq. miles (2.646894 sq. km)
   FIPS code:            52952
   Located within:       Virginia (VA), FIPS 51
   Location:             38.093965 N, 76.826041 W
   ZIP Codes (1990):     22520
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Montross, VA
    Montross