Probably not in the infobox  If its reliably sourceable as common and consistent then include it in the infobox field Note that this means RS say its commonly used Cherry picking  it does not qualify per WPNEOLOGISM If it does suit that sourcing requirement Id still probably argue against it because its a local colloquialism thus trivia if people outside this area do not refer to it this way then the nickname is not of encyclopedic importance Contrast the Big Apple for New York City a nickname with which virtually all Americans and probably most native English speakers are familiar  belongs in a city articles infobox and maybe its lead Its reasonably likely that some RS can be found saying that the Burg is a common nickname of St Petersburg FL but Id bet good money theyre mostly or entirely local or that they say its used by locals PS If it were used in the infobox here it should be as sources most often give it which nom suggests is the Burg not the Burg It wouldnt be capitalized with The in either case per MOSCAPS even if a few sources capitalize it that way