Wikipedia (10 Sep 2014, 08:15)
Saint Petersburg is the second largest city in Russia, politically incorporated as a federal subject (a federal city). It is located on the Neva River at the head of the Gulf of Finland on the Baltic Sea. In 1914 the name of the city was changed from Saint Petersburg to Petrograd (Russian: Петроград; IPA: [pʲɪtrɐˈgrat]), in 1924 to Leningrad (Russian: Ленинград; IPA: [lʲɪnʲɪnˈgrat]), and in 1991, back to Saint Petersburg.
In the referendum on reversing the renaming of Leningrad on June 12, 1991, renaming it to Petrograd was not an option. Only 54.86% of the voters (with a turnout of 65%) supported "St. Petersburg". This change officially took effect on September 6, 1991. Meanwhile, the oblast whose administrative center is also in St. Petersburg is still named Leningrad.