New Jersey Statutes Title 40A. Municipalities and Counties 40A § 6-4

a. First class--cities having a population of more than 150,000;

b. Second class--cities having a population of not less than 12,000 but not more than 150,000;

c. Third class--all cities which are not first- or second-class cities except cities bordering on the Atlantic ocean being seaside or summer resorts;

d. Fourth class--cities bordering on the Atlantic ocean which are seaside or summer resorts.