|Old||New||Area Affected||10D/1+10D Dialing||Overlay||Test Number|
|825||AB: entire province of Alberta, Canada||—||2016-04-09||—|
|336||743||NC: Greensboro, Highpoint, Winston-Salem, northwestern NC||2016-04-23||2016-05-23||743-743-1743|
|548||ON: London, Windsor, southwestern Ontario, Canada||—||2016-06-04||
(610, 810, or 999) +
|631||934||NY: Suffolk County (eastern Long Island)||2016-06-18||2016-07-16||934-990-TEST|
|522||expansion of 1-500 non-geographic services||—||2016-08-01||—|
|315||680||NY: Syracuse, Utica||2017-02-11||2017-03-11||680-990-TEST|
|833||New toll-free code with 800, 888, 877, 866, 855 and 844||not appl.||2017-06-03||(none?)|
|332||NY: New York City (Manhattan only)||—||2017-06-10||332-990-TEST|
|323||213||CA: downtown Los Angeles; Note: 323 and 213 are getting a "boundary elimination overlay," similar to the way that area codes 214 and 972 in Dallas were split and later merged back into an overlay. All existing numbers will remain unchanged, but 1+10D will be mandatory for all calls. When the combined 213 & 323 area runs out of numbers, a third area code will be assigned for the same geographic area.||2017-07-08||2017-08-01||(none)|
|360||(564)||WA: Bellingham, Olympia, Vancouver WA; western Washington State. Note: Mandatory 10-digit dialing will affect all of western Washington (area codes 206, 253, and 425, in addition to 360). However, new numbers in area code 564 will initially be assigned only in the 360 area (outside metro Seattle). As the Seattle metro area codes fill up, they will also begin assigning 564 numbers.||2017-07-29||2017-08-28||564-564-1564|
|208||(986)||ID: entire state of Idaho||2017-08-05||2017-09-05||986-986-1986|
|708||(464)||IL: La Grange, Cicero, suburbs south and west of Chicago (probably in 2017)||t.b.a.||t.b.a.||t.b.a.|
|(521)||non-geographic: more numbers for iPads, tablets, etc. — mostly non-dialable from ordinary phones||—||2017–Q3?||(none)|
|210||(726)||TX: San Antonio||2017-09-23||2017-10-23||726-726-1726|
|814||(582)||PA: Altoona, Erie: originally scheduled as a split for 2012‑02‑01, with Erie changing to 582 and Altoona keeping 814. However, the PPUC is reconsidering the split-or-overlay issue, and the date has been postponed to about 2017 or later.||t.b.a.||2017?||t.b.a.|
|(619 & 858)||CA: San Diego; ("boundary elimination overlay": 619/858 geographic split boundary from 1999 will be 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; (new overlay area code and exact dates not yet officially announced)||2018-05-??||2018-06-??||t.b.a.|
|609||(640)||NJ: Trenton, Atlantic City||2018-08-18||2018-09-17||640-990-TEST|
|709||(879)||NL: entire province of Newfoundland & Labrador, Canada||2018-11-10||2018-11-24||
(610, 620, 630,
640, 710, 777,
888, or 999) +
|(367)||QC: 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
(210, 410, 510,
610, 710, 810,
ou/or 999) +
|510||(341?)||CA: Oakland, Fremont, Richmond; (new overlay area code and exact dates not yet officially announced)||2018 ?||2018 ?||t.b.a.|
|(689?)||FL: Orlando; (new overlay area code and exact dates not yet officially announced; area code 321 will continue to be also a non-overlay code for the "Space Coast" area)||—||2018 ?||t.b.a.|
|506||(428)||NB: entire province of New Brunswick, Canada||???||2019 ?||???|
|217||(447)||IL: Champaign, Springfield; (exact dates not yet officially announced)||2019 ?||2019 ?||t.b.a.|
|314||(557?)||MO: St. Louis; (new overlay area code and exact dates not yet officially announced)||2019 ?||2019 ?||t.b.a.|
|513||(283?)||OH: Cincinnati; (new overlay area code and exact dates not yet officially announced)||2019 ?||2019 ?||t.b.a.|
|440||(220?)||OH: Lorain, Ashtabula; (new overlay area code and exact dates not yet officially announced)||2019 ?||2020 ?||t.b.a.|
|(672)||BC: entire province of British Columbia, Canada||—||2020 ?||???|
|(835?)||PA: Philadelphia suburbs; (new overlay area code and exact dates not yet officially announced)||—||2019 ?||t.b.a.|
|803||(839?)||SC: Columbia, central; (new overlay area code and exact dates not yet officially announced)||2021 ?||2021 ?||t.b.a.|
|(679)||MI: Detroit, Ann Arbor; (679 will overlay 313, circa 2021, and expand to also overlay 734, circa 2023)||2021 ?||2021 ?||t.b.a.|
|618||(730)||IL: East St. Louis, southern||2021 ?||2022 ?||t.b.a.|
|870||(327)||AR: Jonesboro, Pine Bluff, southern, eastern, north central (surrounds Little Rock on 3 sides) originally announced for 2013‑05‑18 but postponed indefinitely||2021 ?||(suspended)||327-327-1327
|(227)||MD: Silver Spring, suburbs of Washington, D.C.; (dates t.b.a.)||—||circa 2022?||t.b.a.|
|920||(274)||WI: Green Bay, northeastern; (originally scheduled for 2014, current projected implementation early 2025!)||t.b.a.||2014‑02‑22 postponed indefinitely||274-274-1274
black - new area code is already in use and mandatory
blue - new area code in permissive status (use either old or new)
green - new area code not yet in use
red - special notations
"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. and Canada will not bill. In cases where a test number is shown ending with –TEST, dial –8378; for –BILL, dial –2455. Where possible, a test number that is known to bill is marked with a "$" before the number.
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 southern California, two old area code splits will be erased in a maneuver known as a "boundary elimination overlay". In downtown Los Angeles, the boundary between 213 and 323 will be eliminated; in San Diego, the boundary between 619 and 858 will be eliminated. In each case, the two existing area codes will become 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 2021 or 2022.
The state of Illinois has not yet established effective dates for the 618/730 (2019?) and 217/447 (2017?) overlays, which will be implemented as the existing codes run low on available numbers.
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; they had their first overlay on 2001‑03‑25 and haven't looked back.
In fact, Canada has already scheduled overlays in all but three provinces, all of which will be getting overlays in 2018 or circa 2019/2020. At that point, 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 current 418 & 581 (future 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.
The Caribbean island of St. Martin is divided between France and the Netherlands. The Dutch side, known as Sint Maarten, has joined the North American Numbering Plan as area code 721; Sint Maarten has also been assigned ISO country code SX, and the corresponding .sx Internet domain is now in use. The change was originally scheduled for 2010, but was postponed until 2011‑09‑30 (permissive), 2012‑09‑30 (mandatory). You now must use +1 721; from North America, dial 1‑721. All current 7-digit numbers in Sint Maarten begin with '5', but new numbering ranges will be added in the future. The French side continues to use +590, or 011‑590 from North America (including calls from Sint Maarten to French Saint-Martin). (The French side now has the ISO country code MF, but .mf is not used for the Internet. Use either .gp (Guadeloupe) or .fr (France) for French St.‑Martin.)
Het Caribische eiland Sint Maarten is verdeeld tussen Frankrijk en Nederland. Het Nederlandse deel heeft zich aangesloten bij de Noord-Amerikaanse Nummering Plan (+1) zoals het netnummer 721. De verandering was oorspronkelijk gepland voor 2010, maar werd uitgesteld. Permissieve bellen eindigde 2012‑09‑30, en de nieuwe nummers zijn nu verplicht. Alle huidige 7-cijferige nummers in Sint Maarten beginnen met '5', maar nieuwe nummering reeksen kunnen worden toegevoegd. Gebruikt u de internationale landcode +1 721; uit Noord-Amerika, kies 1–721. Het Franse deel zal blijven +590 te gebruiken, of 011–590 uit Noord-Amerika. De andere Nederlandse eilanden in het Caribisch gebied niet veranderd. Sint Maarten is toegewezen ISO-landcode SX en de .sx Internet-domein.
L'île antillaise de Saint-Martin est divisée entre la France et les Pays-Bas. La partie néerlandaise, Sint Maarten, a rejoint le Plan de Numérotation Nord-américain (+1) avec l'indicatif régional 721 et le domaine de l'Internet .sx (actuellement en vigueur). Pourtant, la transition a été remise. Composition facultative (composer +599 ou +1 721) a commencé le 2011‑09‑30; à partir de 2012‑09‑30, le +1 721 est obligatoire. Tous les numéros actuels à 7 chiffres à Sint Maarten commencent par '5', mais d'autres numéros pourraient être ajoutés. Pendant la période permissive, on pouvait utiliser l'indicatif de pays +599 ou l'indicatif nord-américain +1 721; en Amérique du Nord, composer le 011–599 ou le 1–721. Maintenant il faut utiliser seulement +1 721. La partie française continuera d'utiliser +590, ou 011–590 d'Amérique du Nord.
Editorial commentary and explanatory notes about area code splits have now been moved off onto a separate page.
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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Got an old number and don't know the new area code? Try the cumulative listing of area code splits, numerically by original area code.
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