In October 2000, Brevard County was split off with area code 321. At the same time, 321 was also overlaid on Orange, Osceola, and Seminole counties. The small portion of Volusia County that was located in 407 (the Deltona area) continued to use only 407. In 2003, it was announced that all new telephone numbers in the three counties would no longer be issued in 321, although 321 numbers in the Orlando metro area would keep that area code.
In 2001, Deltona was switched to area code 386 when 386 was split from 904. All of 407 is now overlaid with 321 and 689.
Area code 689 was assigned as an overlay of 407 (but not the standalone 321 area) in June 2019. Assignments in 321 remain frozen and primarily focused on Brevard County.[2]