Notes about the table below

For older splits and overlays, go to Splits and overlays effective before Note: all dates are presented visually in year-month-day format, but the screen reader will speak them according to your preferences. Dates given in the form of, for example, 2029-Q3 are the third quarter of 2029, as an estimate, with the exact date to be determined. Column 4 gives the date for mandatory 10-digit (or in some cases 1+10-digit) dialing of local calls. Column 5 gives the date when new numbers in the overlay area code may begin to appear.

LincMad’s New Area Code Dates

Last updated

Old New Area Affected 10D/1+10D Dialing Overlay Test Number
8 0 4 6 8 6 VA: Virginia: Richmond, Petersburg; overlay of 8 0 4 & 6 8 6 already in effect 6 8 6, 9 9 0, test (686-990-8378)
7 0 9 8 7 9 entire province of Newfoundland & Labrador, Canada (was postponed indefinitely, but finally happened) • l’ensemble de la province de Terre-Neuve-et-Labrador, Canada (était remis indéfiniment, mais désormais c’est arrivé); (mandatory 10-digit local dialing began • la composition obligatoire de 10 chiffres pour les appels locaux commença le ) (official/officielle) 1, 8 7 9; followed by 6 1 0, 6 3 0, or 6 4 0; followed by either TEST (8 3 7 8) or BILL (2 4 5 5) (billable)
8 7 0 3 2 7 Arkansas: Jonesboro, Pine Bluff, southern, eastern, north central (surrounds Little Rock on 3 sides). After postponing and then advancing the date, the 8 7 0 & 3 2 7 overlay finally took effect on note: Arkansas is also planning to implement a “boundary elimination” overlay on the entire state in 2027; see note about Arkansas' upcoming boundary elimination overlay for more information. 327-327-1327
9 0 4 3 2 4 Jacksonville Florida 324-324-0324
4 4 0 4 3 6 Ohio: Lorain, Ashtabula already in effect 436-436-1436
5 7 3 2 3 5 Missouri: Columbia, Jefferson City, Cape Girardeau, eastern Missouri outside the St. Louis metro area 235-235-1235
8 6 4 8 2 1 South Carolina: Greenville, Spartanburg, northwestern; note: area code 8 6 4 was not affected by “The Big 10D” and kept 7-digit local calls until a month before the overlay 821-821-0821
5 0 7 9 2 4 Minnesota: Rochester, Mankato, southern 924-924-1924
2 1 3 & 3 2 3 7 3 8 California: Downtown Los Angeles (the split boundary between 2 1 3 and 7 3 8 was erased on creating the 2 1 3 & 3 2 3 overlay; 7 3 8 was added as an additional overlay in late 2024) already in effect 738-738-1738
500, etc. 5 3 2 Non-geographic: Mostly non-dialable numbers for iPads and other devices that need a phone number for billing but that cannot receive regular telephone calls. not applicable (none)
7 1 3, etc. 6 2 1 Texas: Houston area 7 1 3 & 2 8 1 & 8 3 2 & 3 4 6 & 6 2 1 overlay already in effect 621-621-1621
5 3 0 8 3 7 California: Redding, Chico, Davis, Tahoe, Lassen, northeastern already in effect 837-837-1837
5 5 9 3 5 7 Fresno California 357-357-1357
4 1 6, etc. 9 4 2 Toronto Ontario, Canada, (only • seulement) already in effect 1, 9 4 2, 6 1 0, followed by either TEST (8 3 7 8) or BILL (2 4 5 5) (billable)
6 0 4, 2 5 0, etc. 2 5 7 British Columbia, entire province • l’ensemble de la province de la Colombie-Britannique already in effect 1, 2 5 7, followed by 5 8 0 or 6 1 0 or 7 1 0 or 8 1 0 or 9 9 9, followed by either TEST (8 3 7 8) or BILL (2 4 5 5) (billable)
2 0 6 existing area code 5 6 4 Seattle Washington; 3 6 0 & 5 6 4 overlay has expanded to include 2 0 6, and will later expand to include 4 2 5 & 2 5 3 already in effect (none)
9 7 0 future 7 4 8 Colorado: Grand Junction, northern and western Colorado, officially scheduled already in effect 748-748-1748
4 2 3 future 7 2 9 Tennessee: Chattanooga & Johnson City, but not Knoxville. Area code 4 2 3 will retain 7-digit local calls (with permissive 10-digit) until shortly before the overlay takes effect. Implementation has been postponed by 6 months. 729-729-0729
3 1 8 future 4 5 7 Louisiana: Shreveport, Alexandria, Monroe, northern 457-457-1457
3 1 3 and later also 7 3 4 future 6 7 9 Michigan: Detroit, Ann Arbor; (officially scheduled); 6 7 9 will overlay 3 1 3 on , and expand to also overlay 7 3 4, circa 2030. Neither 3 1 3 nor 7 3 4 is affected by “The Big 10D.” 679-679-0679
6 6 2 future 4 7 1 Mississippi: Greenville, Tupelo, northern; implementation details to be determined already in effect 471-471-0471
3 3 4 future 4 8 3 Alabama: Montgomery, southeast; implementation details to be determined 483-483-1483
7 1 8, etc. future 4 6 5 the New York City boroughs of Brooklyn, Queens, Bronx, and Staten Island, but not Manhattan already in effect 465-465-1465
5 0 1, 4 7 9, 8 7 0, and 3 2 7 existing area codes 5 0 1, 4 7 9, 8 7 0, and 3 2 7 Arkansas: the entire state; the 8 7 0 & 3 2 7 overlay will expand to cover the entire state in a “boundary elimination” overlay, currently planned for some time in Area code 501 (Little Rock) already has 10D local calls as a result of “The Big 10D” and area codes 8 7 0 & 3 2 7 have 10D as a result of the initial overlay, so only area code 479 (northwest Arkansas) will have to change to 10D in 2027. (none)
7 1 4 & 6 5 7 to be announced California: northern Orange County, Anaheim, Huntington Beach, Santa Ana; my best guess for the new area code is 4 8 2; this will be California’s second triple overlay, after 2 1 3 & 3 2 3 & 7 3 8 already in effect to be announced
4 1 8, etc. future 2 7 3 Quebec, Canada: Gaspé, Québec City, eastern the 4 1 8 & 5 8 1 & 3 6 7 overlay will add area code 2 7 3 • l’est de la province date and new area code subject to change • Le recouvrement des indicatifs 4 1 8 & 5 8 1 & 3 6 7 ajoutera l'indicatif 2 7 3. le date et le nouvel indicatif sous réserve already in effect; déjà en vigueur to be announced; à communiquer
502 to be announced Kentucky: Louisville, Frankfort; My best guess for the new area code is 7 6 1; area code 502 was not affected by The Big 10D to be announced to be announced
9 1 2 future 5 6 5 Georgia: Savannah, coastal areas; overlay area code 5 6 5 has been officially announced, but the date has not yet been decided. Expect it probably in fall 2027. already in effect to be announced
6 2 6 to be announced Pasadena, California: my best guess for the new area code is 4 8 1 or 2 3 0 already in effect to be announced
2 0 7 to be announced entire state of Maine; overlay was projected for 2023 or 2024, but has been pushed back to about My best guess for the new area code is 2 5 8. t.b.a.
How to read the chart

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 t.b.d. - to be determined • à déterminer • se determinará (billable) - test number known to bill

“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.

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.

Notes about specific areas

Arizona

In Phoenix, Arizona, area code 602 underwent a 3-way split in 1999, creating the 4 8 0 and 6 2 3 area codes for the east and west sides, respectively. However, area code 480 was running out of numbers, with 6 0 2 not far behind, while area code 623 had enough numbers to last for several decades. Thus, the Arizona PUC decided to do a first-of-its-kind double boundary elimination overlay. Because area code 623 has by far the most unused numbers, there will be many 6 2 3 numbers assigned to areas now in 4 8 0 and 6 0 2, but few if any 4 8 0 or 6 0 2 numbers will be assigned outside their current boundaries.

Arkansas (new info for 2027)

Area code 870, which covers most of the land area of the state of Arkansas, was scheduled to have an overlay on , but number conservation measures extended its life by several years, so the overlay was postponed indefinitely. The effective date was finally announced: . Of course, 7 months later, the date was advanced by three and a half months; the overlay actually went into effect on .

However, Arkansas is already planning the next area code change: a “boundary elimination” overlay, erasing the boundaries between area codes 5 0 1, 4 7 9, 8 7 0, & 3 2 7, creating one big statewide overlay with (initially) four area codes, in 2027. Implementation details have not yet been determined. Area code 501 already has 10-digit local calls because of the 988 mandate, and 8 7 0 switched to 10D in preparation for the first overlay, but area code 479 will have to introduce 10D for the big overlay. (Early reports suggested 2025, but that is when the network preparation will begin. The actual boundary elimination overlay is planned for 2027.)

California

In southern California, two old area code splits were erased in a maneuver known as a “boundary elimination overlay”. In San Diego, the boundary between 6 1 9 and 8 5 8 was eliminated. In downtown Los Angeles, the boundary between 2 1 3 and 3 2 3 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.) In late 2024, area code 738 was added as an overlay on 2 1 3 & 3 2 3.

Missouri

The state of Missouri approved overlays for area codes 3 1 4 and 8 1 6, originally scheduled for 2001, then postponed until 2002, then suspended indefinitely. , the effective dates were finally announced for 2022 and 2023, although the date for 8 1 6 was then pushed back by 8 months. Both the 3 1 4 & 5 5 7 and the 8 1 6 & 9 7 5 overlays are now in effect. The overlay for area code 573 has also now taken effect: area code 235 was added on

🇨🇦 Canada (English)

The Canadian province of Newfoundland and Labrador was scheduled to have an overlay of new area code 879 on existing area code 709, in but evolving conditions led the CRTC to postpone the overlay repeatedly, and finally postpone it indefinitely. However, the zombie overlay was revived, and officially took effect Thus, the only parts of Canada that do not have overlays are area code 867 (Yukon, Nunavut, and Northwest Territories) and area code 807 (northwest Ontario, including Thunder Bay.)

Note that area code 807 was forced to change to 10-digit local calls, for absolutely no valid reason, but, except for the Yellowknife local calling area, area code 867 gets to keep 7-digit calls.

🇨🇦 Canada (français)

La province de Terre-Neuve-et-Labrador devait mettre en œuvre un recouvrement de l’indicatif 709 avec le nouvel indicatif 879, en mais en raison des conditions évolutives le CRTC a remis plusieurs fois le recouvrement, et enfin le remit indéfiniment. Cependant, le recouvrement mort-vivant est arrivé le Désormais, le Canada recouvre tous les indicatifs sauf le 867 (le Yukon, les T.N.O., et le Nunavut) et le 807 (le nord-ouest de l’Ontario, y compris Thunder Bay).

Noter que l’indicatif 807 passa aux appels à 10 chiffres, sans aucune raison valable, mais, à l’exception de la zone locale de Yellowknife, au 867 on conserve les appels à 7 chiffres.

Time Zone information is now available on the area code locator page, which lists all active and upcoming area codes in numeric order with major cities.