overlay complex is a telephone numbering plan that assigns multiple area codes to the same geographic numbering plan area (NPA). Area code overlays are...

convert 602, 480, and 623 into overlay codes for the entire Phoenix area in 2023. The creation of the three-code overlay complex made ten-digit dialing mandatory...

not part of any overlay complex nonetheless require ten-digit dialing if part of the local calling area is within an overlay complex. For example, the...

Plan (NANP) for the U.S. state of California. They are assigned in an overlay complex to a numbering plan area (NPA) that comprises, roughly, the area of...

to ten-digit dialing, even when the area code is not involved in an overlay complex. Per the timeline set by the North American Numbering Plan Administrator...

782 was added to the numbering plan area in August 2014, to form an overlay complex in relief to prevent telephone number shortages. Numbering plan area...

Bell Atlantic wanted to implement area code 724 as an overlay complex with 412 at a time when overlays were still a new concept, and were met with resistance...

(NANP) for the U.S. state of California. These area codes serve an overlay complex that comprises much of the southeastern and southernmost portions of...

office prefixes, area code 656 was added to the service area forming an overlay complex. Area codes 656 and 813 are assigned to a numbering plan area (NPA)...

was transitioned to 1+10-digit dialing despite not being part of an overlay complex at that time. The area code had telephone numbers assigned for the...

was assigned to the same numbering plan area in 2008, creating an overlay complex. The state of Utah was a single numbering plan area, assigned area...

and North American Numbering Plan Administrator (NANPA) announced an overlay complex for the numbering plan area with new area code 353, with an in-service...

codes created in 1947, and 730 was added to the plan area to form an overlay complex to satisfy the need for more telephone numbers in the region. The current...

area in Missouri, and 235 was added on March 24, 2024 as part of an overlay complex. When the American Telephone and Telegraph Company (AT&T) created a...

split of 909, and 840 was added to the numbering plan area to form an overlay complex effective February 23, 2021. While most of western Riverside County...

720 and 983 were added (in 1998 and 2022 respectively) to form an overlay complex for the area, meaning that the same geographic service area is served...

plan received a second area code, 324 , through the creation of an overlay complex to mitigate central office code exhaustion and provide additional telephone...

513. Area code 326 was added to the numbering plan area to form an overlay complex in March 2020. Area code 937 was created in a split of Ohio's original...

codes created in 1947. The numbering plan area was converted to an overlay complex with area code 975 in 2023. When the American Telephone and Telegraph...

a second area code to the same numbering plan area by creating an overlay complex. Because of its small population, Idaho was among a declining number...

561: Overlay with 728 for all of Palm Beach County: West Palm Beach, Boca Raton, Boynton Beach, Delray Beach, Belle Glade. 645: Overlay complex with 305...

804. Area code 948 was established on February 5, 2020 forming an overlay complex with 757. The service area comprises the Eastern Shore of Virginia...

the numbering plan area was converted to an overlay complex with area code 878, which also forms an overlay with area code 724, in the surroundings of...

Arkansas's original area code of 1947, and 327 was added as part of an overlay complex in 2024. Area code 870 was first created in an area code split of 501...

the Dallas–Fort Worth metroplex. The area codes are assigned in an overlay complex to a single numbering plan area that was the core of one of the original...

code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) that has multiple area codes assigned. Overlay complexes are used...

numbering plan area 213 in 1951, and 657 was added in 2008 to form an overlay complex. In 1947, when the American Telephone and Telegraph Company (AT&T)...

(NANP) for the Canadian province of British Columbia. They form an overlay complex with area code 604, which serves only a small southwestern section...

was overlaid with area code 924 in 2024. It is the first area code overlay complex in Minnesota. The region was directly bordered by 612 (to the north)...

639 and 474 were added to the numbering plan area in creation of an overlay complex for the entire province in 2013 and 2021, respectively. The incumbent...