The Collaborative International Dictionary of English v.0.48:

Amsterdam \Amsterdam\ prop. n. (Geography)
   A large city which is an industrial center and the official
   capital of The Netherlands. Population (2000) = 724,096.

   Syn: Dutch capital, capital of The Netherlands
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Amsterdam
    n 1: an industrial center and the nominal capital of the
         Netherlands; center of the diamond-cutting industry; seat
         of an important stock exchange; known for its canals and
         art museum [syn: Amsterdam, Dutch capital, capital of
         The Netherlands]

U.S. Gazetteer Places (2000):

Amsterdam-Churchill, MT -- U.S. Census Designated Place in Montana
   Population (2000):    727
   Housing Units (2000): 264
   Land area (2000):     4.087390 sq. miles (10.586291 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    4.087390 sq. miles (10.586291 sq. km)
   FIPS code:            01550
   Located within:       Montana (MT), FIPS 30
   Location:             45.747574 N, 111.307556 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Amsterdam-Churchill, MT
    Amsterdam-Churchill
    Amsterdam, MT
    Amsterdam


U.S. Gazetteer Places (2000):

Amsterdam, NY -- U.S. city in New York
   Population (2000):    18355
   Housing Units (2000): 9277
   Land area (2000):     5.946829 sq. miles (15.402215 sq. km)
   Water area (2000):    0.338529 sq. miles (0.876786 sq. km)
   Total area (2000):    6.285358 sq. miles (16.279001 sq. km)
   FIPS code:            02066
   Located within:       New York (NY), FIPS 36
   Location:             42.943350 N, 74.190310 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Amsterdam, NY
    Amsterdam


U.S. Gazetteer Places (2000):

Amsterdam, OH -- U.S. village in Ohio
   Population (2000):    568
   Housing Units (2000): 251
   Land area (2000):     0.314598 sq. miles (0.814804 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.314598 sq. miles (0.814804 sq. km)
   FIPS code:            01938
   Located within:       Ohio (OH), FIPS 39
   Location:             40.471814 N, 80.921194 W
   ZIP Codes (1990):     43903
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Amsterdam, OH
    Amsterdam


U.S. Gazetteer Places (2000):

Amsterdam, MO -- U.S. city in Missouri
   Population (2000):    281
   Housing Units (2000): 109
   Land area (2000):     0.584267 sq. miles (1.513245 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.584267 sq. miles (1.513245 sq. km)
   FIPS code:            01090
   Located within:       Missouri (MO), FIPS 29
   Location:             38.350484 N, 94.587497 W
   ZIP Codes (1990):     64723
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Amsterdam, MO
    Amsterdam