Area codes 561 and 728

Area codes 561 and 728 are telephone area codes in the North American Numbering Plan (NANP) for Palm Beach County in the U.S. state of Florida.

[1] Within only five years of creation, NPA 561 was experiencing rapid exhaustion of central office codes from growth of service demands in the Palm Beaches/Treasure Coast region and the proliferation of cell phones.

In mitigation, the northern part of 561, the Treasure Coast, was split off with area code 772 in 2002.

This service configuration in the region was sufficient for twenty-one years until on January 4, 2022, the Florida Public Service Commission decided and approved an all-services overlay for the NPA, with an effective in-service date of March 10, 2023.

[2] A permissive dialing period was not necessary for this overlay, because area code 561 already had a ten-digit dialing requirement, because prior to October 2021, it had telephone numbers assigned for the central office code 988.