__TOC__ An area code overlay is a numbering plan area (NPA) in the

North American Numbering Plan The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the international callin ...

(NANP) that has multiple

area code A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, rea ...

s assigned.

Overlay plan Overlay may refer to: Computers *Overlay network, a computer network which is built on top of another network *Hardware overlay, one type of video overlay that uses memory dedicated to the application *Another term for exec, replacing one process ...

s are used to increase the number of available

telephone number A telephone number is a sequence of digits assigned to a landline telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices f ...

s in a

province A province is almost always an administrative division within a country or sovereign state, state. The term derives from the ancient Roman ''Roman province, provincia'', which was the major territorial and administrative unit of the Roman Empire ...

state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * ''The State'' (newspaper), a daily newspaper in Columbia, South Carolina, United States * ''Our S ...

, or region.Haar, Dan and Vanessa Hua
"Regulators Have Area Code Plan"
''The Courant''. August 18, 1999. Accessed October 28, 2005. The North American Numbering Plan Administrator (NANPA) maintains the definitive list of overlays in the United States. The majority of overlays have occurred since 1995. The process has been driven by fragmentation of numbering resources by a growing number of

competitive local exchange carrier A competitive local exchange carrier (CLEC), in the United States and Canada, is a telecommunications provider company (sometimes called a " carrier") competing with other, already established carriers, generally the incumbent local exchange carrie ...

Active area code overlays

Pending and planned overlays

Various new area codes are planned or proposed. A few overlay implementations (247 WI, 354 QC, 679 MI, 870 AR, 975 MO, et al.) have been suspended, often because wasteful allocation of telephone numbers has been mitigated by

number pooling Number pooling is a method of reallocating telephony numbering space in the North American Numbering Plan, primarily in growth areas in the United States. Instead of allocating blocks of ten thousand numbers to each carrier in each community, a bl ...

or other conservation efforts. * 274 was assigned for an overlay of

920 __NOTOC__ Year 920 ( CMXX) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire * December 17 – Romanos I has himself crowned co-emperor of the Byza ...

, originally scheduled for 2012, then postponed to 2014, and finally indefinitely postponed. *

354 __NOTOC__ Year 354 ( CCCLIV) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantius and Constantius (or, less frequently, yea ...

was assigned for an overlay of 450 and 579, originally scheduled for October 24, 2020, but the additional overlay has been postponed indefinitely. * 387 is reserved as a future overlay for 416. * 428 is planned for overlay of

506 Year 506 (Roman numerals, DVI) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Flavius Ennodius Messala, Messala and Areobindus Dagalai ...

starting on April 29, 2023. * 557 is planned for overlay of 314 starting in August 2022. * 564 currently overlays

360 360 may refer to: * 360 (number) * 360 AD, a year * 360 BC, a year * 360 degrees, a circle Businesses and organizations * 360 Architecture, an American architectural design firm * Ngong Ping 360, a tourism project in Lantau Island, Hong Kong * Q ...

, but will expand to overlay area codes 206, 253, and 425 as those

Seattle Seattle ( ) is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2020 population of 737,015, it is the largest city in both the state of Washington and the Pacific Northwest regio ...

-area codes run out of numbers. *

656 __NOTOC__ Year 656 ( DCLVI) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 656 for this year has been used since the early medieval period, when the Anno Domini calendar era bec ...

is planned for an overlay of

813 Events By place Byzantine Empire * June 22 – Battle of Versinikia: The Bulgars, led by Krum, ruler ('' khan'') of the Bulgarian Empire, defeat Emperor Michael I near Edirne (modern Turkey). The Byzantine army (26,000 men) ...

in mid-to-late February 2022. *

679 __NOTOC__ Year 679 ( DCLXXIX) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 679 for this year has been used since the early medieval period, when the Anno Domini calendar ...

, planned to overlay 313 in Michigan., indefinitely postponed. *

728 __NOTOC__ Year 728 ( DCCXXVIII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 728 for this year has been used since the early medieval period, when the Anno Domini calendar e ...

, planned to overlay 561 in Florida, to go into effect March 2023 *

730 __NOTOC__ Year 730 ( DCCXXX) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 730 for this year has been used since the early medieval period, when the Anno Domini calendar era ...

is reserved as a future overlay for

618 __NOTOC__ Year 618 ( DCXVIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 618 for this year has been used since the early medieval period, when the Anno Domini calendar era ...

in southern Illinois, expected to go into effect on July 7, 2023. *

742 __NOTOC__ Year 742 ( DCCXLII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 742 for this year has been used since the early medieval period, when the Anno Domini calendar era ...

is reserved as a future overlay for 905. * 826 will overlay 540 in

Virginia Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth ar ...

on June 14, 2022. * Area_code_list.html" ;"title="Communications in Pennsylvania">Area code list"> 835 is proposed to overlay 610 and 484. This plan has been suspended by the Pennsylvania Public Utilities Commission. * 861 is reserved as a future overlay for 309 in western Illinois, expected to go into effect on February 24, 2023. * 879 is planned to overlay 709 in

948_ Year_948_(_CMXLVIII)_was_a_leap_year_starting_on_Saturday_(link_will_display_the_full_calendar)_of_the_Julian_calendar. __Events_ __By_place_ __Byzantine_Empire_ *__Arab–Byzantine_War:_Hamdanid_forces_under_Sayf_al-Dawla_raid_into_Asia_Minor_...

_is_planned_for_an_overlay_of_

_is_planned_for_an_overlay_of_Area_codes_757_and_948">757_ 757_may_refer_to: *_Boeing_757:_a_narrow-body_airliner *__AD_757:_a_year *_757_BC:_a_year *_757_(number):_a_number *_Area_code_757_ Image:Area_code_757.png,_The_area_colored_red_indicates_the_southeast_corner_of_Virginia_served_by_area_code_757 po_...

Active area code overlays

Pending and planned overlays

References