The Collaborative International Dictionary of English v.0.48:

Leningrad \Leningrad\ prop. n.
   A city in the European part of Soviet Russia; the former
   capital of Russia. The name was formerly St. Petersburg and
   Petrograd, and was changed back to Saint Petersburg
   (Sankt Peterburg in Russian) in 1992.

   Syn: St. Petersburg, Peterburg, Petrograd, Saint Petersburg.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

St. Petersburg
    n 1: a city in western Florida on Tampa Bay; a popular winter
         resort [syn: St. Petersburg, Saint Petersburg]
    2: a city in the European part of Russia; 2nd largest Russian
       city; located at the head of the Gulf of Finland; former
       capital of Russia [syn: St. Petersburg, Leningrad,
       Peterburg, Petrograd, Saint Petersburg]

U.S. Gazetteer Places (2000):

St. Petersburg, FL -- U.S. city in Florida
   Population (2000):    248232
   Housing Units (2000): 124618
   Land area (2000):     59.627040 sq. miles (154.433318 sq. km)
   Water area (2000):    73.451363 sq. miles (190.238150 sq. km)
   Total area (2000):    133.078403 sq. miles (344.671468 sq. km)
   FIPS code:            63000
   Located within:       Florida (FL), FIPS 12
   Location:             27.782254 N, 82.667619 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    St. Petersburg, FL
    St. Petersburg


U.S. Gazetteer Places (2000):

St. Petersburg, PA -- U.S. borough in Pennsylvania
   Population (2000):    405
   Housing Units (2000): 168
   Land area (2000):     0.340388 sq. miles (0.881602 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.340388 sq. miles (0.881602 sq. km)
   FIPS code:            67384
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             41.160944 N, 79.653937 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    St. Petersburg, PA
    St. Petersburg