Nabisco Chelsea factory (now Chelsea Market), 75 Ninth Avenue, New York, NY, United States
Mondelez International
Wikipedia[2], Untapped Cities[4] and Hoboken Girl[1] all state the first Oreo was sold on 6 March 1912 to a Hoboken grocer; a New York Almanack snippet gives 6 April as a shipping date, which conflicts but is not adopted.
Nabisco's Oreo Biscuit, a chocolate sandwich cookie with cream filling made at its Chelsea factory in New York, was first sold on 6 March 1912 to a grocer in Hoboken, New Jersey.