Camden County prosecutor's spokesman Jason Laughlin says the list also included the names of three students and a school staff member.
No one was injured.
School superintendent James Chapman said in a posting on the district's Web site that the boys said the list was a joke.
CBS affiliate KYW in Philadelphia reports that school officials did not take this as a laughing matter and immediately contacted the Pennsauken Police Department who arrested the students. No weapons were found on the boys or in their lockers and authorities said police also conducted a search of their homes.