N.J. Stat. Ann. § 2B:6-4

Multi-County Vicinage; Apportionment of Costs. Where a judge of the Law Division or of the Family Part of the Chancery Division is assigned to cases from a vicinage including more than one county, the salary of that judge and of any employee of that judge and any expenses related to that judge shall be apportioned between the counties composing the vicinage in the manner determined by the assignment judge for that vicinage after consultation and negotiation with the governing body of each of the counties comprising the vicinage. Source: N.J.S.2A:11-10