New Jersey Statutes Title 40A. Municipalities and Counties 40A § 9-4

(1) It shall be unlawful for a person to hold simultaneously an elective county office and an elective municipal office.

(2) It shall be lawful for a member of the Legislature of the State to hold simultaneously any appointive office or position in county or municipal government.

(3) Nothing contained in this section shall be deemed to prevent the incumbent of any office from abstaining from voting in any matter in which the incumbent believes he or she has a conflict of duty or of interest, nor to prevent a challenge of a right to vote on that account under the principles of the common law or any statute.

(5) Notwithstanding the provision of paragraph (1) of this section, a person who, on the effective date of P.L.2007, c. 161, holds simultaneously an elective county office and an elective municipal office may continue to hold the elective offices simultaneously if service in those elective offices is continuous following the effective date of P.L.2007, c. 161.

(6) It shall be lawful for a member of a volunteer fire company, ambulance, first aid, hazardous materials, or rescue squad, including an officer of the company or squad, to serve as an elected official on the governing body of the municipal government wherein the emergency services are provided; however, the volunteer shall recuse himself from any vote concerning the emergency services provider of which he is a member.In municipalities below 5,000 in population, recusal from such votes shall only be required for officers, directors, and trustees of the company or squad.