The Collaborative International Dictionary of English v.0.48:

Gramercy \Gra*mer"cy\, interj. [F. grand-merci. See Grand, and
   Mercy.]
   A word formerly used to express thankfulness, with surprise;
   many thanks.
   [1913 Webster]

         Gramercy, Mammon, said the gentle knight. --Spenser.
   [1913 Webster]

U.S. Gazetteer Places (2000):

Gramercy, LA -- U.S. town in Louisiana
   Population (2000):    3066
   Housing Units (2000): 1163
   Land area (2000):     2.074935 sq. miles (5.374057 sq. km)
   Water area (2000):    0.031768 sq. miles (0.082280 sq. km)
   Total area (2000):    2.106703 sq. miles (5.456337 sq. km)
   FIPS code:            30550
   Located within:       Louisiana (LA), FIPS 22
   Location:             30.053907 N, 90.689154 W
   ZIP Codes (1990):     70052
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gramercy, LA
    Gramercy