The Collaborative International Dictionary of English v.0.48:

Dulce \Dulce\, v. t.
   To make sweet; to soothe. [Obs.]
   [1913 Webster]

U.S. Gazetteer Places (2000):

Dulce, NM -- U.S. Census Designated Place in New Mexico
   Population (2000):    2623
   Housing Units (2000): 899
   Land area (2000):     12.945967 sq. miles (33.529898 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    12.945967 sq. miles (33.529898 sq. km)
   FIPS code:            21390
   Located within:       New Mexico (NM), FIPS 35
   Location:             36.939557 N, 106.989600 W
   ZIP Codes (1990):     87528
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dulce, NM
    Dulce