WordNet (r) 3.0 (2006):

Merrimac
    n 1: an ironclad vessel built by the Confederate forces in the
         hope of breaking the blockade imposed by the North

U.S. Gazetteer Places (2000):

Merrimac, WI -- U.S. village in Wisconsin
   Population (2000):    416
   Housing Units (2000): 218
   Land area (2000):     0.759306 sq. miles (1.966593 sq. km)
   Water area (2000):    0.648027 sq. miles (1.678383 sq. km)
   Total area (2000):    1.407333 sq. miles (3.644976 sq. km)
   FIPS code:            51325
   Located within:       Wisconsin (WI), FIPS 55
   Location:             43.373910 N, 89.628857 W
   ZIP Codes (1990):     53561
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Merrimac, WI
    Merrimac


U.S. Gazetteer Places (2000):

Merrimac, VA -- U.S. Census Designated Place in Virginia
   Population (2000):    1751
   Housing Units (2000): 934
   Land area (2000):     1.817338 sq. miles (4.706884 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.817338 sq. miles (4.706884 sq. km)
   FIPS code:            51208
   Located within:       Virginia (VA), FIPS 51
   Location:             37.192257 N, 80.422247 W
   ZIP Codes (1990):     23185
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Merrimac, VA
    Merrimac