 Bergen County is the most populous county—as of the 2010 Census—with 905,116 people, while Salem County is the least populous with 66,083 people.Until the 1960s, the New Jersey Senate had 21 representatives, one from each county regardless of population.In the wake of the 1964 decision by the Supreme Court of the United States in "Reynolds v. Sims", establishing the one man, one vote principle that state legislative districts must be approximately equal in size, David Friedland filed suit in New Jersey Supreme Court on behalf of two union leaders, challenging a system under which each county was represented by a single member in the New Jersey Senate.