
| Old | New | Area Affected | Permissive | Mandatory | Test Number |
|---|---|---|---|---|---|
| 915 | 325 | TX: Abilene, San Angelo | 2003-04-05 | 2003-10-04 | 325-303-3333 |
| 915 | 432 | TX: Midland, Odessa; (El Paso keeps 915) | 2003-04-05 | 2003-10-04 | 432-304-3333 |
| 903 | 430 | TX: Tyler, northeast (OVERLAY) | NONE | 2003-04-28 | 430-301-3333 |
| 909 | 951 | CA: Riverside and western Riverside County | 2004-07-17 | 2004-10-30 | 951-800-0951 |
| 601 | 769 | MS: Jackson, central (OVERLAY) | NONE | 2005-04-18 | 769-769-1111 |
| 706 | 762 | GA: northern Georgia except Atlanta metro area (OVERLAY) | NONE | 2006-05-16 | 762-222-7777 |
| 310 | 424 | CA: San Pedro, Torrance, Santa Monica, Malibu, incl. Avalon (Santa Catalina Island) (emergency split revived by CPUC, postponed indefinitely, finally implemented as an OVERLAY in 2006.) | NONE | 2006-08-26 | 424-424-0424 |
| 519 | 226 | ON: southwestern peninsula, London, Windsor (OVERLAY) | NONE | 2006-10-28 | 226-510-TEST 226-610-TEST $226-610-BILL 226-810-TEST |
| 514 | 438 | QC: Montréal (OVERLAY) | NONE | 2006-10-28 | 438-510-TEST 438-610-TEST $438-610-BILL 438-810-TEST |
| 815 | 779 | IL: Rockford, Joliet (OVERLAY) | NONE | 2007-03-17 | 779-779-0000 |
| 505 | 575 | NM: Las Cruces, Roswell, Taos (not Albuquerque, Santa Fe, Farmington) | 2007-10-07 | 2008-10-05 | 575-600-1234 575-580-0575 575-295-0000 |
| 630 | 331 | IL: Aurora, Hinsdale (OVERLAY) | NONE | t.b.a. | 331-330-0331 |
| 618 | 730 | IL: East St. Louis, southern (OVERLAY) | NONE | t.b.a. | t.b.a. |
| 217 | 447 | IL: Champaign, Springfield (OVERLAY) | NONE | 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. 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.
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.
More details about area code splits and overlays can be found on the AreaCode-Info pages, maintained by John Cropper and Eric Morson. There is also an excellent listing of state/provincial regulatory agencies provided by the state of New York.
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Go to postponed splits and overlays
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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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