When the Justice Department of the United States mandated AT&T Corporation to break up the Bell System, one of the seven Baby Bells was Bell Atlantic, the original name for Verizon. Bell Atlantic came into existence in 1984 with a footprint from New Jersey to Virginia, with each area having a separate operating company (consisting of New Jersey Bell, Bell of Pennsylvania, Diamond State Telephone, and C&P Telephone).
As part of the rebranding that the Baby Bells took in the mid-1990s, all of the operating companies assumed the Bell Atlantic name. In 1997, Bell Atlantic expanded into New York and the New England states by merging with fellow Baby Bell NYNEX. Although Bell Atlantic was the surviving company, the merged company moved its headquarters from Philadelphia to NYNEX's old headquarters in New York City. In 2000, Bell Atlantic acquired GTE, which operated telecommunications companies across most of the rest of the country that was not already in Bell Atlantic's footprint. Bell Atlantic, the surviving company, changed its name to "Verizon", a portmanteau of veritas (Latin for "truth") and horizon.
As of 2016, Verizon is one of three companies that had their roots in the former Baby Bells. The other two, like Verizon, exist as a result of mergers among fellow former Baby Bell members. One, SBC Communications, bought out the Bells' former parent AT&T Corporation and assumed the AT&T name. The other, CenturyLink, was formed initially in 2011 by the acquisition of Qwest (formerly named US West). Its Verizon Wireless subsidiary is the largest U.S. wireless communications service provider as of September 2014, with 147 million mobile customers. And as of current, it is the only publicly-traded telecommunications company to have two stock listings in its home country, both the NYSE (VZ; main) and Nasdaq (VZA; secondary) As of 2017, it is also the second largest telecommunications company by revenue after AT&T.
Bell Atlantic Corporation was created as one of the original Regional Bell Operating Companies (RBOCs) in 1984, during the breakup of the Bell System. Bell Atlantic's original roster of operating companies included: