Saint Petersburg, Russia (population 5384342.0)
Saint Petersburg (Russian: Са́нкт-Петербу́рг Sankt-Peterburg), known as Petrograd (Петроград) in 1914-1924 and Leningrad (Ленинград) in 1924-1991, is the second largest city of Russia, with 5.6 million inhabitants (2021), and the former capital of the Russian Empire.