When was New York City the capital of the U.S.? July 22, 2020February 2, 2012 by Pamela Landy New York City was named the capital of America in 1788 and remained so until 1800, when Washington, D.C. was so named. Related AnswersHas New York always been the nation's most populous city? Yes, at least since 1800. At that time, Philadelphia and…Who are the five Mafia families of New York City? The five Mafia families of New York City in the…Who first sighted the land that became New York City? Giovanni da Verrazano, an Italian explorer, first sighted Manhattan in…How many women died in the Triangle Waist Company fire in New York City? At least 146 women, mainly young immigrants, died in the…For how long did New York City have a Miss Subways? The Miss Subways program, run by the New York Subway…Where was Needle Park in New York City? Needle Park, the infamous hangout in New York for addicts…