|Old||New||Area Affected||10D/1+10D Dialing||Overlay||Test Number|
|619 & 858||CA: San Diego; (“boundary elimination overlay”: 619/858 geographic split boundary from 1999 has been erased, forming the new 619 & 858 overlay, effective 2018-06-19)||2018-05-19||2018-06-19||(none)|
|805||820||CA: San Luis Obispo, Oxnard||2018-06-02||2018-06-30||820-820-1820|
|609||640||NJ: Trenton, Atlantic City||2018-08-18||2018-09-17||640-990-TEST|
eastern Québec, Canada, including Québec city and Gaspé Peninsula
l’est de la province de Québec, Canada, y compris la ville de Québec et la Gaspésie
(The test numbers 367–710–TEST and –BILL were withdrawn.)
(Les numéros d’essai 367–710–8378 et –2455 ont été retirés.)
(210, 410, 510,
ou/or 999) +
|876||658||Jamaica: entire nation||2019-03-30||2019-04-30||
|672||BC: entire province of British Columbia, Canada||—||2019-05-04||
(580, 610, 710,
810, or 999) +
|689||FL: Orlando; (area code 321 continues to be also a non-overlay code for the “Space Coast” area)||—||2019-06-04||689-689-1689|
|524||non-geographic: more numbers for iPads, tablets, etc. — mostly non-dialable from ordinary phones||—||2019-07-12||(none)|
|510||341||CA: Oakland, Fremont, Richmond||2019-06-22||2019-07-22||341-341-1341|
|205||659||AL: Birmingham, Tuscaloosa||2019-10-12||2019-11-12||659-659-1659|
|803||839||SC: Columbia, central||2020-04-25||2020-05-26||839-839-1839|
|525||non-geographic: more numbers for iPads, tablets, etc. — mostly non-dialable from ordinary phones||—||2020-07-13||(none)|
|945||TX: Dallas and suburbs; area code 945 will be added to 214 & 972 & 469 overlay||—||2021-01-15||945-945-1945|
|526||non-geographic: more numbers for iPads, tablets, etc. — mostly non-dialable from ordinary phones||—||2021-01-28||(none)|
|909||840||CA: San Bernardino, Ontario||2021-01-23||2021-02-23||840-840-1840|
|217||447||IL: Champaign, Springfield||2021-02-27||2021-03-27||447-447-1447|
|814||582||PA: Altoona, Erie: originally scheduled as an overlay in 2002, then shelved, then scheduled as a split for 2012-02-01, with Erie changing to 582 and Altoona keeping 814, then shelved again. However, the overlay finally happened on 2021-05-01.||2021-04-03||2021-05-01||582-990-TEST|
|405||572||OK: Oklahoma City||2021-04-24||2021-05-24||572-572-1572|
|850||448||FL: Tallahassee, Pensacola, panhandle||2021-05-22||2021-06-22||448-448-1448|
|(474)||SK: entire province of Saskatchewan, Canada||—||2021-10-02||t.b.a./AC|
|(742)||ON: Toronto suburbs (not including the city of Toronto); the 905 & 289 & 365 overlay will add 742 on 2021-10-16||—||2021-10-16||
(222, 610, or 999)
|(multi)||—||Major change throughout the United States: A total of 82 U.S. area codes in 35 states (plus Guam) will change to mandatory 10-digit or 1+10D dialing for local calls, phased in from 2021-10-24 through 2022-07-15, in preparation for the introduction of the national 988 suicide prevention lifeline. (More information on “The Big 10D”)||2021-10-24||2022-07-16||—|
|202||(771)||DC: the city of Washington, D.C.||2021-10-09||2021-11-09||771-990-TEST|
|708||(464)||IL: La Grange, certain suburbs south or west of Chicago; (Date pushed back from late 2017 to late 2021 to early 2024, but now pushed forward to late 2021 or early 2022, to be announced on very short notice. Note: 708 is already scheduled to convert to mandatory 1+10D local calling on 2021-10-24 as part of the Big 10D.)||t.b.a.||2021-Q4/2022-Q1?||t.b.a.|
|813||(656)||FL: Tampa; (postponed due to Covid-19)||
|(983)||CO: Denver metro area||—||2022-04-12||(t.b.a.)|
entire province of Alberta, Canada, area codes
403, 780, 587, and 825; 368 overlay will be added on
||—||2022-04-23||368 + (410, 610, 645, 710, 810, 888, or 999) + (–TEST/–8378 or –BILL/–2455)|
|757||(948)||VA: Norfolk, Virginia Beach (revised official dates)||2022-04-09||2022-05-09||948-990-TEST|
|540||(826)||VA: Roanoke, Harrisonburg, outer suburbs of Washington, D.C.||2022-05-14||2022-06-14||826-990-TEST|
|(683)||ON: Sudbury, Peterborough||—||2022-06-18
|1–683–610 + –TEST(–8378) or/ou –BILL(–2455)|
|209||(350?)||CA: Stockton, Modesto; (The 209 area code was expected to run out of numbers around 2026 or 2027, but updated projections have advanced that date to late 2022. Relief planning is underway, with details expected soon. It will definitely be an overlay, though, because 209 already has to change to 1+10D local dialing as part of The Big 10D. The new area code has not been announced, but 350 is an educated guess.)||2021-10-24||2022-Q2?||t.b.d.|
|(943)||GA: Atlanta metro area; (The 404 & 770 & 678 & 470 overlay will add 943)||—||2022-08-15||943-943-1943|
|(468)||QC: Gatineau/Hull, central, western, and northern Québec • Gatineau/Hull, le centre, l’ouest, et le nord du Québec||—||2022-10-22
|1–468 + (210 or/ou 610) + —TEST(–8378) or/ou –BILL(–2455)|
|(835?)||PA: Philadelphia suburbs; (new overlay area code and exact dates not yet officially announced)||—||2022? 2023?||t.b.a.|
|314||(557)||MO: St. Louis; (suspended; exact dates not yet officially announced)||2021-10-24||2022-Q4 ?||t.b.a.|
|910||(429?)||NC: Wilmington, Fayetteville; (The 910 area code is expected to run out of numbers in early 2023, so relief planning is already underway. It will definitely be an overlay, since 910 is already scheduled to change to 10D local calling because of The Big 10D. The new overlay area code has not been officially announced, but 429 is an educated guess.)||2021-10-24||2022-Q4 ?||t.b.a.|
|516||(565?)||NY: Nassau County (western Long Island); (The 516 area code is expected to run out of numbers in mid-2023, so relief planning is already underway. It will definitely be an overlay, since 516 is already scheduled to change to 10D local calling because of The Big 10D. The new overlay area code has not been officially announced; 565 is an educated guess, but definitely a guess.)||2021-10-24||2023-Q1 ?||t.b.a.|
|(354)||QC: Laval, suburbs/banlieue of Montréal; postponed indefinitely • remis indéfiniment||—||
(580, 610, 710, 999)
[subject to change/sous réserve]
entire province of New Brunswick, Canada •
l’ensemble de la province du Nouveau-Brunswick
|(753)||ON: Ottawa [tentative date of 2023-06-10 may be advanced to late 2022 • la date provisoire du 2023-06-10 pourrait être avancée à la fin de 2022]||—||2023-06-10||t.b.a./AC|
|707||(627?)||CA: north coast of California, Santa Rosa, Napa, Eureka; (The 707 area code is expected to run out of numbers in late 2023, so relief planning is already underway. It will definitely be an overlay, since 707 is already scheduled to change to 10D local calling because of The Big 10D. The new overlay area code has not been officially announced; 627 and 369 were previously reserved for a planned three-way split of 707, so the overlay code will likely be one of those two.)||2021-10-24||2023-Q2 ?||t.b.a.|
|870||AR: Jonesboro, Pine Bluff, southern, eastern, north central (surrounds Little Rock on 3 sides) originally announced for 2013-05-18 but postponed indefinitely, estimated 2023-Q2||2023 ?||(suspended)
|513||(283)||OH: Cincinnati; (suspended; exact dates not yet officially announced)||2024 ?||2024 ?||t.b.a.|
|(227)||MD: Silver Spring, suburbs of Washington, D.C.; (dates t.b.a.)||—||2024 ?||t.b.a.|
|(263)||QC: Montréal (city only, not including suburbs) • (la ville seulement, banlieue non incluse)||—||2024 ?||t.b.a./AC|
|(679)||MI: Detroit, Ann Arbor; (suspended; 679 will overlay 313, circa 2026, and expand to also overlay 734, circa 2038)||2026 ?||2026 ?||t.b.a.|
|920||WI: Green Bay, northeastern; (originally scheduled for 2014, current projected implementation 2026-Q4 !)||t.b.a.||
|440||(tba)||OH: Lorain, Ashtabula; (new overlay area code not yet officially announced; relief postponed to about 2028)||t.b.a.||2028 ?||t.b.a.|
|618||(730)||IL: East St. Louis, southern; (postponed)||2029 ?||2029 ?||t.b.a.|
|709||(879)||NL: entire province of Newfoundland & Labrador, Canada (postponed indefinitely) • l’ensemble de la province de Terre-Neuve-et-Labrador, Canada (remis indéfiniment)||
(610, 620, 630, 640,
710, 777, 888, or 999)
black - new area code is already in use
blue - mandatory 10D (or 1+10D) dialing is in effect in preparation for an overlay
green - new area code not yet in use
red - special notations
t.b.a. - to be announced • à communiquer • se anunciará
“10D/1+10D” refers to the date on which it becomes mandatory to dial all local calls with the area code. In some areas, you must dial only the area code and number, for a total of 10 digits. In other areas, you must dial 1 plus the area code and number on all calls. In yet other areas, you may optionally dial 10D or 1+10D on some or all local calls, or for calls within your own area code overlay whether the call is local or toll. If no date is listed in this column, the area already has mandatory 10D/1+10D local calls, or the listing is for a non-geographic code (such as toll-free numbers) in which there are no local calls, as such.
“Overlay” refers to the date on which the new code goes into effect; that is, the first date on which numbers in the new code may be assigned and used.
New area codes indicated with a question mark are speculation, based on available industry data. However, the information should not be considered reliable until it is officially confirmed by NANPA.
The Test Number is a special number (usually, though not always, not charged) that allows you to test whether all the links in the chain from you to a new area code are operating correctly. In order for you to reach a new area code, your premises equipment (office PBX, for example) must allow you to dial it. Then the telco central office must accept the new area code as valid and route it correctly. If the new area code is outside your LATA, your chosen long-distance carrier must also route the call correctly. Calling one of these numbers will usually reach a simple recording saying something like, “You have successfully completed a call to area code XXX.” Note that some test numbers are billable numbers, possibly at international rates. However, most test numbers in the U.S. will not bill. In cases where a test number is shown ending with –TEST, dial –8378 (no charge); for –BILL, dial –2455 (billed).
Note that the test number for a new area code is usually disconnected within a few months after the mandatory date. If you dial one of the older test numbers shown here, you may reach an ordinary subscriber.
In early 2021, several area codes that were not expected to run out of numbers until 2024 or later, found themselves with revised projections indicating they need overlays Real Soon Now. The most stark of these is Illinois’ area code 708 (see below).
The state of Illinois approved overlays for area codes 217, 708, and 618, but left the implementation dates open, to be triggered when each area code runs low enough on available numbers. The 217/447 overlay happened on (2021-03-27), 708/464 is expected in late 2021 or early 2022, and 618/730 is currently projected for 2026. The plan indicated that there would be a 13‑month transition period in each area for permissive and then mandatory 10‑digit dialing, test numbers, and finally assignment and activation of numbers in the new area code. However, as of this writing 708 is only about 9 months from running out of numbers, and the final implementation details are still to be determined. The saving grace is that 708 and 618 (and all the area codes in Illinois) are slated for mandatory 10D local calls as of 2021-10-24, so a major hurdle for both telcos and customers will already be cleared when the overlays are ready to be activated. (In fact, nationally, of the area codes that are keeping 7D local calls, the first to see an overlay is likely to be Maine’s 207 around mid-2024.)
The Canadian province of
Newfoundland and Labrador
was scheduled to have an overlay of new area code 879
on existing area code 709,
but evolving conditions led the CRTC to postpone the overlay
repeatedly, and finally postpone it indefinitely.
fr: La province canadienne de
Terre-Neuve-et-Labrador devait mettre
en œuvre un recouvrement de l’indicatif 709 avec le
nouvel indicatif 879, à compter du
mais en raison des conditions évolutives le CRTC a remis
plusieurs fois le recouvrement, et enfin le remit indéfiniment.
The Canadian province of New Brunswick
was scheduled to have an overlay of new area code 428 on existing
area code 506, effective
but evolving conditions led the CRTC to postpone the overlay,
and again to 2023-04-29.
fr: La province canadienne du
Nouveau-Brunswick devait mettre
en œuvre un recouvrement de l’indicatif 506 avec le
nouvel indicatif 428, à compter du
mais en raison des conditions évolutives le CRTC a remis
le recouvrement. La date d’entrée en vigueur de
a été remis encore jusqu’au 2023-04-29.
In southern California, two old area code splits have been erased in a maneuver known as a “boundary elimination overlay”. In downtown Los Angeles, the boundary between 213 and 323 has been eliminated; in San Diego, the boundary between 619 and 858 was eliminated. In each case, the two existing area codes became an overlay, with numbers from either code assignable anywhere in the combined geographic territory.
Area code 870, which covers most of the land area of the state of Arkansas, was scheduled to have an overlay on 2013-05-18, but number conservation measures extended its life by several years, so the overlay has been postponed indefinitely. Look for it some time around 2023.
There have been no area code splits — only overlays — since 2007-10-07, and no splits are planned. Canada has not had an area code split since 1999-01-25; Canada had its first overlay on 2001-03-25 and hasn’t looked back.
In fact, Canada is already planning overlays in every province, not including the territories of northern Canada, between now and 2024, although the overlay for Newfoundland and Labrador has been postponed indefinitely. When that overlay finally happens, the only parts of Canada Without overlays will be area code 867 (Yukon, Northwest Territories, and Nunavut) and area code 807 (northwestern Ontario, including Thunder Bay). On the chopping block also are local interprovincial 7‑digit dialing arrangements for Labrador City and Wabush, NL, and for Campbellton, NB, into the 418 & 581 & 367 area of eastern Québec. Those 7‑digit dialing arrangements will be terminated when Newfoundland & Labrador and New Brunswick implement mandatory 10‑digit local calls in preparation for their own overlays.
fr: En fait, le Canada prévoit déjà recouvrir tous les indicatifs (sauf 867 et 807) avant 2024, mais le recouvrement de Terre-Neuve-et-Labrador (709) a été remis indéfiniment. À partir de ce recouvrement, les seules régions du Canada sans recouvrements seront l’indicatif 867 — le Yukon, les T.N.O., et le Nunavut — et l’indicatif 807 — le nord-ouest de l’Ontario, y compris Thunder Bay. On va éliminer aussi les arrangements interprovinciaux de composition locale à 7 chiffres pour Labrador City et pour Wabush, et pour Campbellton, Nouveau-Brunswick, vers l’est du Québec. Ces arrangements seront remis lorsque Terre-Neuve-et-Labrador et le Nouveau-Brunswick mettront en œuvre la composition locale obligatoire à 10 chiffres pour se préparer à leurs propres recouvrements.
Don’t see a split listed here that used to be? Splits and overlays that have been cancelled or indefinitely postponed may no longer be shown.
Time Zone information is now available on the “Locator” page, which lists all active and upcoming area codes in numeric order with major cities.
There is an excellent listing of state/provincial regulatory agencies [link updated 2017-05-24] provided by the state of New York.
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