The Collaborative International Dictionary of English v.0.48:

London \Lon"don\, n.
   The capital city of England.
   [1913 Webster]

   London paste (Med.), a paste made of caustic soda and
      unslacked lime; -- used as a caustic to destroy tumors and
      other morbid enlargements.

   London pride. (Bot.)
   (a) A garden name for Saxifraga umbrosa, a hardy perennial
       herbaceous plant, a native of high lands in Great
       Britain.
   (b) A name anciently given to the Sweet William. --Dr. Prior.

   London rocket (Bot.), a cruciferous plant (Sisymbrium
      Irio) which sprung up in London abundantly on the ruins
      of the great fire of 1667.
      [1913 Webster]

WordNet (r) 3.0 (2006):

London
    n 1: the capital and largest city of England; located on the
         Thames in southeastern England; financial and industrial
         and cultural center [syn: London, Greater London,
         British capital, capital of the United Kingdom]
    2: United States writer of novels based on experiences in the
       Klondike gold rush (1876-1916) [syn: London, Jack London,
       John Griffith Chaney]

U.S. Gazetteer Places (2000):

London, AR -- U.S. city in Arkansas
   Population (2000):    925
   Housing Units (2000): 413
   Land area (2000):     2.399586 sq. miles (6.214898 sq. km)
   Water area (2000):    0.038662 sq. miles (0.100133 sq. km)
   Total area (2000):    2.438248 sq. miles (6.315031 sq. km)
   FIPS code:            41270
   Located within:       Arkansas (AR), FIPS 05
   Location:             35.325802 N, 93.236557 W
   ZIP Codes (1990):     72847
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    London, AR
    London


U.S. Gazetteer Places (2000):

London, CA -- U.S. Census Designated Place in California
   Population (2000):    1848
   Housing Units (2000): 424
   Land area (2000):     0.627788 sq. miles (1.625963 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.627788 sq. miles (1.625963 sq. km)
   FIPS code:            42566
   Located within:       California (CA), FIPS 06
   Location:             36.475995 N, 119.442332 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    London, CA
    London


U.S. Gazetteer Places (2000):

London, OH -- U.S. city in Ohio
   Population (2000):    8771
   Housing Units (2000): 3848
   Land area (2000):     8.507574 sq. miles (22.034515 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    8.507574 sq. miles (22.034515 sq. km)
   FIPS code:            44674
   Located within:       Ohio (OH), FIPS 39
   Location:             39.887466 N, 83.445041 W
   ZIP Codes (1990):     43140
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    London, OH
    London


U.S. Gazetteer Places (2000):

London, KY -- U.S. city in Kentucky
   Population (2000):    5692
   Housing Units (2000): 2676
   Land area (2000):     7.711430 sq. miles (19.972510 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    7.711430 sq. miles (19.972510 sq. km)
   FIPS code:            47476
   Located within:       Kentucky (KY), FIPS 21
   Location:             37.127504 N, 84.084181 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    London, KY
    London