
| Old | New | Area Affected | Permissive | Mandatory | Test Number |
|---|---|---|---|---|---|
| 304 | 681 | WV: entire state (Overlay) | — | 2009‑03‑28 | 681-990-TEST |
| 801 | 385 | UT: Salt Lake City, Provo, Ogden (Overlay) (originally to be a split in 2001, then postponed, postponed again, postponed yet again, and finally reinstated as an overlay) | — | 2009‑03‑29 | 385-600-1234 |
| 818 | 747 | CA: San Fernando Valley (Los Angeles County) (Overlay) | — | 2009‑05‑18 | 747-222-TEST |
| 809 829 |
849 | Dominican Republic (Overlay • Superposición) | — | 2009‑07‑01 | $849-222-9999 |
| 312 773 |
872 | IL: Chicago (entire city) (Overlay); 312 and 773 retain their distinct geographic identities, but 872 overlays both | — | 2009‑11‑07 | 872-872-1872 |
| 760 | 442 | CA: Oceanside, Escondido, northern San Diego County, Palm Springs, Death Valley, eastern Sierra Nevada, inland areas: originally scheduled as a split for late 2008, changed to an Overlay at the last minute. All existing 760 numbers will remain unchanged. | — | 2009‑11‑21 | 442-442-1442 442-730-TEST 442-973-TEST |
| 203 | 475 | CT: New Haven, Stamford, southwest corner (Overlay); ordered, postponed, re-postponed, and finally in effect! | — | 2009‑12‑12 | $475-288-0288 |
| 541 | 458 | OR: Eugene, Bend, Medford; all but the northwest corner (Overlay) (not Portland, Salem, Astoria) | — | 2010‑02‑10 | 458-222-TEST 458-333-TEST 458-444-TEST |
| 613 | 343 | ON: Ottawa, eastern (Overlay) | — | 2010‑05‑17 | $343-510-BILL 343-510-TEST $343-610-BILL 343-610-TEST $343-810-BILL 343-810-TEST |
| 256 | 938 | AL: Huntsville, northern and east central (Overlay) | — | 2010‑07‑10 | 938-926-2222 938-946-4444 |
| 715 | 534 | WI: Eau Claire, northern/northwestern (Overlay) | — | 2010‑08‑14 | 534-534-1534 534-222-TEST |
| 450 | 579 | QC: Laval, Longueuil, suburbs/banlieues of Montréal (Overlay • Chevauchement) | — | 2010‑08‑21 | $579-510-BILL 579-510-TEST $579-610-BILL 579-610-TEST $579-810-BILL 579-810-TEST |
| 705 | 249 | ON: Sudbury, north central (Overlay) | — | 2011‑03‑19 |
$249-210-BILL 249-210-TEST $249-510-BILL 249-510-TEST $249-610-BILL 249-610-TEST $249-710-BILL 249-710-TEST $249-810-BILL 249-810-TEST |
| 402 | 531 | NE: Omaha, Lincoln, eastern (Overlay) | — | 2011‑03‑26 | 531-FOR-TEST (531-367-8378) 531-NEW-TEST (531-639-8378) |
| 918 | 539 | OK: Tulsa, northeastern (Overlay) | — | 2011‑04‑01 | 539-539-1539 |
| 718 347 |
929 | NY: New York City boroughs of Bronx, Brooklyn, Queens, Staten Island (Overlay) (Manhattan's 212 & 646 codes are not affected. Area code 917 overlays all five boroughs.) | — | 2011‑04‑16 | 929-222-9901 |
| — | 721 | Sint Maarten (Dutch side of the island of St. Martin in the Caribbean; changing from +599 to +1 721, or, calling from North America, from 011‑599 to 1‑721.) (The French side of the island remains +590, or 011‑590.) | 2011‑09‑30 | 2012‑09‑30 | 721-MAARTEN (721-622-7836) 721-622-7837 721-622-7838 |
| 410 443 |
667 | MD: Baltimore, Annapolis, northeastern; (Overlay) | — | 2012‑03‑24 | 667-999-TEST 667-222-TEST |
| 919 | 984 | NC: Raleigh; (Overlay) | — | 2012‑04‑30 | 984-984-1984 |
| 500 533 544 |
(566) | expansion of 1‑500 PCS "follow-me" numbers | — | 2012‑Q3 ? | t.b.a. |
| 819 | (873) | QC: Hull, Trois-Rivières, Kuujjuaq • south-central, western, and northern • centre-sud, ouest, et nord; (Overlay • Chevauchement) | — | 2012‑09‑15 |
873-410-TEST $873-410-BILL 873-510-TEST $873-510-BILL 873-610-TEST $873-610-BILL 873-710-TEST $873-710-BILL 873-810-TEST $873-810-BILL |
| 204 | (431) | MB: entire province of Manitoba (Overlay) | — | 2012‑11‑03 | 431-610-TEST $431-610-BILL 431-710-TEST $431-710-BILL 431-810-TEST $431-810-BILL |
| 408 | (669) | CA: San Jose, "Silicon Valley" (Overlay) | — | 2012‑11‑20 | 669-669-1669 |
| 570 | (272) | PA: Scranton, Wilkes-Barre (Overlay) | — | 2012 or 2013? | t.b.a. |
| 860 | (959) | CT: Hartford, northern and eastern (Overlay) | — | 2012 or 2013? | t.b.a. |
| 905 289 |
(365) | ON: Mississauga, Hamilton, suburbs of Toronto (Overlay) | — | 2013‑03‑25 |
365-510-TEST $365-510-BILL 365-610-TEST $365-610-BILL 365-710-TEST $365-710-BILL 365-810-TEST $365-810-BILL |
| 416 647 |
(437) | ON: city of Toronto (Overlay) | — | 2013‑03‑25 |
437-510-TEST $437-510-BILL 437-580-TEST $437-580-BILL 437-610-TEST $437-610-BILL 437-710-TEST $437-710-BILL 437-810-TEST $437-810-BILL |
| 870 | (327) | AR: Jonesboro, Pine Bluff, southern, eastern, north central (surrounds Little Rock on 3 sides) (Overlay) | — | 2013‑05‑18 | 327-327-1327 327-639-TEST |
| 306 | (639) | SK: Saskatchewan: entire province (Overlay) | — | 2013‑05‑25 |
639-510-TEST $639-510-BILL 639-610-TEST $639-610-BILL 639-710-TEST $639-710-BILL 639-810-TEST $639-810-BILL |
| 604 250 778 |
(236) | BC: British Columbia: entire province (Overlay) | — | 2013‑06‑01 |
236-410-TEST $236-410-BILL 236-510-TEST $236-510-BILL 236-610-TEST $236-610-BILL 236-710-TEST $236-710-BILL 236-810-TEST $236-810-BILL |
| 920 | (274) | WI: Green Bay, northeastern (Overlay) | — | 2014‑02‑22 | 274-274-1274 274-222-TEST |
| 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 2014. | — | 2014? | t.b.a. |
| 270 | (364) | KY: westernmost tip: (Canceled) | — | — | — |
| 618 | (730) | IL: East St. Louis, southern (Overlay) | — | t.b.a. | t.b.a. |
| 217 | (447) | IL: Champaign, Springfield (Overlay) | — | t.b.a. | t.b.a. |
black - new area code is already mandatory (use only the new area code)
blue - new area code in permissive status (use
either old or new)
green - new area code not yet in use (use old area
code until permissive date)
red - special notations
"Permissive" refers to the date at which it becomes possible to use either the old or the new area code. You should begin using the new number as soon as possible after the permissive date.
"Mandatory" refers to the date at which it becomes necessary to use the new area code. If you dial the old area code after the mandatory date, you will reach an error recording — or worse, a wrong number.
An overlay is a new area code that occupies the same geographic territory as the existing area code. Existing numbers are not changed, but new prefixes are assigned from the new area code.
A realignment is the assignment of prefixes at the border of one area code to an existing adjacent area code. Only the indicated area is affected; other numbers in either area code are unchanged.
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.
The state of Illinois has not yet established effective dates for the 618/730 and 217/447 overlays, which will be implemented as the existing codes run low on available numbers. Likewise, Pennsylvania will implement the 570/272 overlay when 570 runs low on numbers, probably in late 2012 or early 2013.
The 270/364 split in western Kentucky was postponed several times and then finally cancelled. As of late 2011, there are no area code splits pending or planned anywhere in the NANP — only overlays!
Long-dormant overlay plans in Maryland and North Carolina are finally being implemented, more than 10 years after the overlays were originally ordered.
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. The change was originally scheduled for 2010, but was postponed until 2011‑09‑30 (permissive), 2012‑09‑30 (mandatory). During the permissive period, use either +599 or +1 721; from North America, dial either 011‑599 or 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. (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 begon op 2011‑09‑30, en de nieuwe nummers zijn verplicht 2012‑09‑30. Alle huidige 7-cijferige nummers in Sint Maarten beginnen met '5', maar nieuwe nummering reeksen kunnen worden toegevoegd. Tijdens de permissieve periode, gebruikt u de internationale landcode +599 of +1 721; uit Noord-Amerika, kies 011–599 of 1–721. Het Franse deel zal blijven +590 te gebruiken, of 011–590 uit Noord-Amerika. 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 peuvent être ajoutés. Pendant la période permissive, on peut utiliser l'indicatif de pays +599 ou l'indicatif nord-américain +1 721; en Amérique du Nord, composez le 011–599 ou le 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 provided by the state of New York.
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