The Collaborative International Dictionary of English v.0.48:

Kremlin \Krem"lin\, n. [Russ. kremle.]
   1. The citadel of a town or city; especially, the citadel of
      Moscow, a large inclosure which contains imperial palaces,
      cathedrals, churches, an arsenal, etc. [Russia]

   2. Hence: The government of Russia (or, 1920-1992, of the
      Soviet Union). [metonymical]
      [PJC]

WordNet (r) 3.0 (2006):

Kremlin
    n 1: citadel of Moscow, housing the offices of the Russian
         government
    2: citadel of a Russian town

U.S. Gazetteer Places (2000):

Kremlin, MT -- U.S. Census Designated Place in Montana
   Population (2000):    126
   Housing Units (2000): 57
   Land area (2000):     0.453638 sq. miles (1.174918 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.453638 sq. miles (1.174918 sq. km)
   FIPS code:            41725
   Located within:       Montana (MT), FIPS 30
   Location:             48.571398 N, 110.085927 W
   ZIP Codes (1990):     59532
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Kremlin, MT
    Kremlin


U.S. Gazetteer Places (2000):

Kremlin, OK -- U.S. town in Oklahoma
   Population (2000):    240
   Housing Units (2000): 112
   Land area (2000):     0.252661 sq. miles (0.654389 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.252661 sq. miles (0.654389 sq. km)
   FIPS code:            40400
   Located within:       Oklahoma (OK), FIPS 40
   Location:             36.547642 N, 97.832236 W
   ZIP Codes (1990):     73753
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Kremlin, OK
    Kremlin