When was the former name "St. Petersburg" returned to Leningrad?

On twenty six Jan 1924, shortly once the death of Vladimir Ilyich Ulyanov, it absolutely was renamed to metropolis (Russian: Ленинград, IPA: [lʲɪnʲɪnˈgrat]), which means 'Lenin's City'. On half-dozen Sept 1991, the first name, Sankt-Peterburg, was came back by wide  vote. Today, in English town is understood as Saint Petersburg Campaign.