N.J. Stat. Ann. § 18A:54-11

County vocational schools organized after July 1, 1931, shall not, except as otherwise in this chapter provided, include the territory within the school district boundaries of any city having a resident public school enrollment of 15,000 or more, if such city is maintaining a system of vocational education approved for the purposes of federal or state allotment of vocational funds by the commissioner under the regulations of the state board.