Four Democrats and two Republicans are in the special election to fill the U.S. Senate seat that opened when Frank Lautenberg died last week.
The Republicans are Somerset physician Alieta Eck and former Bogota Mayor Steve Lonegan.
Newark Mayor Cory Booker, Assembly Speaker Sheila Oliver and Reps. Frank Pallone and Rush Holt all filed papers to enter the Democratic race.
The deadline to get on the ballot for the Oct. 16 election was 4 p.m. Monday.
Meanwhile, the man Gov. Chris Christie appointed to fill Lautenberg's seat until the special election, Jeffrey Chiesa, took the oath of office on Capitol Hill on Monday.
The 47-year-old Republican is a longtime Christie colleague. He won't run in the special election to complete the term, which expires in January 2015.
Chiesa is the first Republican senator from New Jersey since another fill-in back in 1982.
With Chiesa's arrival, the Senate has 52 Democrats, 46 Republicans and two independents who often vote with the Democrats.