WordNet (r) 3.0 (2006):

Merrimack
    n 1: a river that rises in south central New Hampshire and flows
         through Concord and Manchester into Massachusetts and
         empties into the Atlantic Ocean [syn: Merrimack,
         Merrimack River]

U.S. Gazetteer Counties (2000):

Merrimack -- U.S. County in New Hampshire
   Population (2000):    136225
   Housing Units (2000): 56244
   Land area (2000):     934.430198 sq. miles (2420.162999 sq. km)
   Water area (2000):    22.060394 sq. miles (57.136156 sq. km)
   Total area (2000):    956.490592 sq. miles (2477.299155 sq. km)
   Located within:       New Hampshire (NH), FIPS 33
   Location:             43.277704 N, 71.637253 W
   Headwords:
    Merrimack
    Merrimack, NH
    Merrimack County
    Merrimack County, NH