LincMad’s Area Code Split Dates
“Old News” Listing

Last updated

Includes splits and overlays begun by
Now listed in reverse order (most recent first)
Go to more current listing

Old New Area Affected Permissive Mandatory
525 non-geographic: more numbers for iPads, tablets, etc. — mostly non-dialable from ordinary phones
803 839 SC: Columbia, central
937 326 OH: Dayton
205 659 AL: Birmingham, Tuscaloosa
510 341 CA: Oakland, Fremont, Richmond
524 non-geographic: more numbers for iPads, tablets, etc. — mostly non-dialable from ordinary phones
689 FL: Orlando; (area code 321 continues to be also a non-overlay code for the “Space Coast” area)
672 🇨🇦 BC: entire province of British Columbia, Canada
876 658 🇯🇲 Jamaica: entire nation
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
609 640 NJ: Trenton, Atlantic City
805 820 CA: San Luis Obispo, Oxnard
619 & 858 CA: San Diego; (“boundary elimination overlay”: 619/858 geographic split boundary from 1999 has been erased, forming the new 619 & 858 overlay)
916 279 CA: Sacramento
445 PA: Philadelphia
456 Inbound International 56K Data Services (discontinued) [*]
210 726 TX: San Antonio
717 223 PA: Harrisburg
521 non-geographic: more numbers for iPads, tablets, etc. — mostly non-dialable from ordinary phones
518 838 NY: Albany
208 986 ID: entire state of Idaho
360 564 WA: Bellingham, Olympia, Vancouver WA; western Washington State. Note: Mandatory 10-digit dialing affects 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.
323 213 CA: downtown Los Angeles, “boundary elimination overlay”; when the combined 213 & 323 area runs out of numbers, a third area code will be assigned for the same geographic area. In practice, the inner core remains mostly 213 only, while the outer “donut” is mostly 323 with some 213 numbers.
332 NY: New York City (Manhattan only)
833 New toll-free code with 800, 888, 877, 866, 855 and 844
315 680 NY: Syracuse, Utica
317 463 IN: Indianapolis
522 expansion of 1–500 non-geographic services
631 934 NY: Suffolk County (eastern Long Island)
548 🇨🇦 ON: London, Windsor, southwestern Ontario, Canada
336 743 NC: Greensboro, Highpoint, Winston-Salem, northwestern NC
825 🇨🇦 AB: entire province of Alberta, Canada
614 380 OH: Columbus
843 854 SC: Charleston, coastal areas
588 expansion of 1–500 non-geographic services
305 786 FL: Florida Keys; (overlay expansion: 305 & 786 overlay expanded from Miami only to include the Keys)
740 220 OH: Zanesville, Marion, southeastern
615 629 TN: Nashville, central and north central
600 622 🇨🇦 Canada: Non-geographic services in Canada only (expansion of 600)
415 628 CA: San Francisco, Marin County; originally scheduled as an overlay for !
902 782 🇨🇦 NS & PE: Nova Scotia and Prince Edward Island (both provinces)
812 930 IN: Evansville, Terre Haute, Bloomington, southern
860 959 CT: Hartford, northern and eastern
346 TX: Houston and suburbs
702 725 NV: Las Vegas metro area
577 expansion of 1–500 non-geographic services
270 364 KY: westernmost tip
844 New toll-free code
570 272 PA: Scranton, Wilkes-Barre
512 737 TX: Austin
236 🇨🇦 BC: British Columbia: entire province
306 639 🇨🇦 SK: Saskatchewan: entire province
437 🇨🇦 ON: city of Toronto
365 🇨🇦 ON: Mississauga, Hamilton, suburbs of Toronto
408 669 CA: San Jose, “Silicon Valley”
204 431 🇨🇦 MB: entire province of Manitoba
819 873 🇨🇦 QC: Gatineau-Hull, Trois-Rivières, Kuujjuaq • south-central, western, and northern • centre-sud, ouest, et nord
919 984 NC: Raleigh
566 expansion of 1–500 non-geographic services
667 MD: Baltimore, Annapolis, northeastern
Int’l 721 🇸🇽 Sint Maarten (Dutch side of the island of St. Martin in the Caribbean; changed 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.)
929 NY: New York City boroughs of Bronx, Brooklyn, Queens, Staten Island (not Manhattan); (Area code 917 overlays all five boroughs.)
918 539 OK: Tulsa, northeastern
402 531 NE: Omaha, Lincoln, eastern
705 249 🇨🇦 ON: Sudbury, north central
544 expansion of 1–500 non-geographic services
855 New toll-free code
450 579 🇨🇦 QC: Laval, Longueuil, suburbs/banlieues of Montréal
715 534 WI: Eau Claire, northern/northwestern
256 938 AL: Huntsville, northern and east central
613 343 🇨🇦 ON: Ottawa, eastern
541 458 OR: Eugene, Bend, Medford; all but the northwest corner (not Portland, Salem, Astoria)
203 475 CT: New Haven, Stamford, southwest corner; ordered, postponed, re-postponed, and finally took effect!
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)
872 IL: Chicago (entire city); 312 and 773 retain their distinct geographic identities, but 872 overlays both
849 🇩🇴 Dominican Republic
818 747 CA: San Fernando Valley (Los Angeles County)
500 533 expansion of 1-500 non-geographic services
801 385 UT: Salt Lake City, Provo, Ogden (originally to be a split in 2001, then postponed, postponed again, postponed yet again, and finally reinstated as an overlay)
304 681 WV: entire state
714 657 CA: Anaheim, northern Orange County
587 🇨🇦 AB: entire province (587 overlays both 403 [Calgary, southern] and 780 [Edmonton, northern])
418 581 🇨🇦 QC: Québec city, Gaspé
503 971 OR: Tillamook, Astoria, coastal area; (overlay expansion: 503 & 971 was originally a “concentrated overlay” only for the Portland/Salem area, leaving the coastal area in area code 503 only, with 7-digit local dialing. The overlay now covers the entire 503 area.)
505 575 NM: Las Cruces, Roswell, Taos (not Albuquerque, Santa Fe, Farmington) (Last U.S. area code split)
630 331 IL: Aurora, Hinsdale
985 504 LA: Lower Plaquemines Parish and the Mississippi River Delta (realignment) (see note below)
778 🇨🇦 BC: entire province (overlay expansion: 778 was originally a concentrated overlay on Vancouver and the urban portion of 604, but was expanded to a general overlay on the entire province, including the 250 area code and the rural areas of 604.)
815 779 IL: Rockford, Joliet
514 438 🇨🇦 QC: Montréal
519 226 🇨🇦 ON: southwestern peninsula, London, Windsor
310 424 CA: San Pedro, Torrance, Santa Monica, Malibu, incl. Avalon (Santa Catalina Island) (service-specific overlay, then overlay, then emergency split revived by CPUC, then postponed indefinitely, finally implemented as an overlay in 2006.)
706 762 GA: northern Georgia except Atlanta metro area
809 829 🇩🇴 Dominican Republic (First NANP area code overlay outside US & Canada)
601 769 MS: Jackson, central
Int’l 684 🇦🇸 AS American Samoa: entire territory; changed from country code +684 (i.e., 011–684) to area code +1 684 (i.e., 1–684)
909 951 CA: Riverside and western Riverside County
903 430 TX: Tyler, northeast
915 432 TX: Midland, Odessa; (El Paso keeps 915)
915 325 TX: Abilene, San Angelo
248 947 MI: Oakland County
616 269 MI: Kalamazoo, Battle Creek; (Grand Rapids keeps 616)
941 239 FL: Lee and Collier Counties, plus the mainland portion of Monroe County (Everglades); Ft. Myers and Naples
561 772 FL: Martin, St. Lucie, and Indian River Counties; Ft. Pierce, Sebastian
501 479 AR: Fort Smith, Fayetteville, northwest (split boundary changed after original announcement)
219 574 IN: South Bend, north central (Note: La Porte stayed 219, rather than splitting to 574 as originally planned.)
219 260 IN: Fort Wayne, northeastern, including Ligonier and Cromwell
847 224 IL: northern suburbs of Chicago
419 567 OH: Toledo, northwest
973 862 NJ: Newark, Morristown (originally announced as 356)
732 848 NJ: New Brunswick, northern Jersey Shore
201 551 NJ: Hackensack, Jersey City
716 585 NY: Rochester (Note: split boundary exactly follows county lines, except that Indian reservations are not divided. Niagara, Erie, Cattaraugus, and Chautauqua Counties, plus the Tonawanda and Oil Springs reservations, keep 716. Points east changed to 585.)
604 778 🇨🇦 BC: Vancouver metro area, Abbotsford, Mission; (originally a concentrated overlay on Vancouver metro area, later expanded to all of 604, and then expanded again to serve the entire province, both 604 and 250)
954 754 FL: Ft. Lauderdale, Broward County
810 586 MI: Macomb County (Warren); (was to be an overlay, changed to a split)
787 939 🇵🇷 PR: Puerto Rico (entire island)
470 GA: Atlanta area
540 276 VA: southwestern corner; (A second split was planned for 2005, with Roanoke changing to an unspecified new area code. However, the second split was mothballed, and in 2022, area code 540 was overlaid with 826.)
520 928 AZ: Flagstaff, Yuma, most of the state [everything but metro Phoenix (602/480/623) and the southeast corner (Tucson and Nogales retained 520)]
334 251 AL: Mobile, southwestern
905 289 🇨🇦 ON: Toronto suburbs, Niagara Falls
804 434 VA: Charlottesville, Lynchburg, Danville, Emporia
517 989 MI: Saginaw, northeast lower Michigan (originally scheduled for )
978 351 MA: northeast
781 339 MA: outer suburbs of Boston
617 857 MA: Boston
508 774 MA: Worcester, Cape Cod, southeast
704 980 NC: Charlotte area
319 563 IA: Dubuque, Davenport/Quad Cities, Clinton, Decorah
416 647 🇨🇦 ON: city of Toronto (all 6 boroughs) (First Canadian area code overlay)
407 386 FL: DeBary, Deltona (southern Volusia County) (realignment) (The DeBary rate center, which includes part of the city of Deltona, was realigned from the 407 area code into the new 386 area code, simultaneously with the 904/386 split.)
904 386 FL: the areas west and south of metro Jacksonville (Lake City, Live Oak, Daytona Beach, Palatka)
901 731 TN: western, except Memphis
504 985 LA: southeast except New Orleans (504) and Baton Rouge (225)
316 620 KS: southern Kansas except Wichita
330 234 OH: Akron, Canton, Youngstown
817 682 TX: Fort Worth area
503 971 OR: Portland, Salem, but not Tillamook, Astoria (originally a concentrated overlay, excluding Tillamook & Astoria; expanded in 2008)
912 478 GA: Macon, central
912 229 GA: Albany, Valdosta, southwestern
866 New toll-free code n/a
515 641 IA: Mason City, Marshalltown, Oskaloosa, Ottumwa, Creston, Guthrie Center
914 845 NY: Poughkeepsie, Monticello, Newburgh, New City, all of 914 except Westchester County
606 859 KY: Lexington, Covington, suburbs of Cincinnati OH (Note: 859=U.Ky.)
703 571 VA: Arlington, Washington suburbs
612 952 MN: Bloomington, southwestern suburbs of Minneapolis
612 763 MN: Brooklyn Park, northwestern suburbs of Minneapolis
409 979 TX: Bryan/College Station, Wharton, Bay City, southeast Texas west of Houston
409 936 TX: Nacogdoches, Lufkin, Huntsville, east Texas north of Houston
407 321 FL: Orlando, Kissimmee, not Melbourne, Titusville; (overlay, in a bizarre combination with a split)
407 321 FL: Melbourne, Titusville, not Orlando, Kissimmee; (split, in a bizarre combination with an overlay) (Note: 3-2-1-blastoff for the Space Coast)
423 865 TN: Knoxville area (not Chattanooga, not Johnson City) (Note: 865=VOL for U.Tenn. Volunteers)
516 631 NY: Suffolk County (eastern Long Island)
318 337 LA: Lafayette, Lake Charles, southwestern
718 347 NY: New York City (Bronx, Brooklyn, Queens, Staten Island; not Manhattan)
414 262 WI: Racine, Kenosha, Waukesha, West Bend, Lake Geneva (not Milwaukee)
941 863 FL: Lakeland, Okeechobee
212 646 NY: New York City (Manhattan only)
469 TX: Dallas (inner and outer)
610 484 PA: Allentown, Bethlehem, Reading, Pottstown, Norristown, King of Prussia, Coatesville, Bangor, Bethel
215 267 PA: Philadelphia, Bucks County, Kulpsville
619 858 CA: near north suburbs of San Diego (La Jolla, Poway, Rancho Bernardo, Rancho Santa Fe) (Split was erased in a “boundary elimination overlay,” effective , creating the 619 & 858 overlay.)
609 856 NJ: Camden, Vineland, southwestern
616 231 MI: NW lower peninsula; Muskegon, Traverse City
314 636 MO: St. Charles, Chesterfield, Union [*]
601 662 MS: northern half, Greenville, Tupelo
502 270 KY: Bowling Green, Paducah, Owensboro, western
602 623 AZ: Glendale, Peoria, Sun City, “West Valley” Phoenix area
602 480 AZ: Scottsdale, Mesa, “East Valley” Phoenix area
502 270 KY: Louisville, western half (overlay changed to split) [*] cancelled cancelled
512 361 TX: Corpus Christi, Victoria, Kingsville [*]
805 661 CA: Bakersfield, Earlimart, Lancaster, northern Los Angeles County
403 780 🇨🇦 AB: Edmonton, Wetaskiwin, Grande Prairie, Jasper, Fort McMurray, Lloydminster, Camrose, northern [*] (Last Canadian area code split)
832 TX: Houston (inner and outer); (overlay, reversing the previous split and adding a third code)
702 775 NV: Reno, Carson City, Elko, Ely, everything except most of Clark County (Las Vegas)
TX: Dallas, Plano, Richardson, Irving, Grand Prairie, Waxahachie, McKinney, Kaufman, Garland, Duncanville, Lewisville (overlay, erasing previous split)
717 570 PA: Scranton, Wilkes-Barre, Williamsport, Stroudsburg, Selinsgrove, Pottsville, Hazleton
209 559 CA: Fresno, Madera, Chowchilla, Tulare, Coalinga, Porterville, Visalia, Kings Canyon/Sequoia N.P.s
813 727 FL: Tampa Bay area (cancelled — overlay changed to split) (see revised data below)
303 720 CO: Denver metropolitan area
504 225 LA: Baton Rouge, New Roads, Donaldsonville
612 651 MN: St. Paul, eastern portion of Twin Cities area
408 831 CA: Salinas, Santa Cruz, Monterey, Hollister, King City
813 727 FL: St. Petersburg, Clearwater, Dunedin, Port Richey, Pinellas County and western Pasco County
305 786 FL: Miami, Dade County (concentrated overlay, did not affect Florida Keys, which retained 305 only until 2015)
514 450 🇨🇦 Québec: Laval, Longueuil, St.-Lambert, Joliette, Granby, St.-Hyacinthe, Lachute; (surrounds but does not include Montréal)
213 323 CA: Los Angeles outer downtown “doughnut” (Split was erased in a “boundary elimination overlay,” effective , creating the 213 & 323 overlay.)
809 784 🇻🇨 St. Vincent & the Grenadines (Note: With the completion of this split, area code 809 now serves only the Dominican Republic.)
714 949 CA: Irvine, southern Orange County
205 256 AL: Huntsville, Anniston, Decatur, Gadsden, Talladega, northern/northeastern areas
919 252 NC: Greenville, Rocky Mount, Kinston, Henderson, Morehead City, Cape Hatteras region
803 843 SC: Charleston, Florence, Walterboro, coastal areas
704 828 NC: Asheville, Hickory, Boone, western tip
510 925 CA: Walnut Creek, Livermore, San Ramon, Concord
412 724 PA: Sharon, New Castle, Kittanning, Uniontown, Indiana, Latrobe, McCandless (not Pittsburgh) [*]
678 GA: Atlanta region (includes Atlanta, Marietta, Norcross, Smyrna) (overlays both 404 & 770)
910 336 NC: Greensboro, Winston-Salem, Asheboro, Burlington, Roxboro (Note: some areas remained in 910 until permissive date of 1998-03-22.)
313 734 MI: Ann Arbor, Monroe (see note on Livonia)
614 740 OH: Lancaster, Zanesville, Newark, Steubenville
916 530 CA: Chico, Redding, Lake Tahoe, Yuba City, Yreka
405 580 OK: Lawton, Enid, Ponca City, Ardmore, Ada, Hugo, Idabel, Weatherford, Clinton, Guymon
809 473 🇬🇩 Grenada & Carriacou
867 🇨🇦 Yukon, Nunavut, Northwest Territories
816 660 MO: Sedalia, Marshall, Maryville, Butler, Moberly, Alexandria, Boonville, Clinton, Warsaw
916 707 CA: Dixon (realignment)
809 767 🇩🇲 Dominica
809 284 🇻🇬 British Virgin Islands
801 435 UT: Logan, Tooele, Nephi, Price, Moab
601 228 MS: Biloxi, Gulfport, Pascagoula, Bay St. Louis, Hurley (extreme south)
615 931 TN: Clarksville, Columbia, Cookeville, Dover, Erin, McMinnville, Sparta, middle TN except Nashville
508 978 MA: Lowell, Methuen, Andover, Athol, Barre, Berlin, Billerica, Carlisle, Concord, Gloucester, Groton, Leominster, New Salem, North Reading, Peabody, Salem, Sterling, Sudbury, Wendell
617 781 MA: Boston’s outer suburbs: Arlington, Bedford, Braintree, Dedham, Halifax, Hanson, Hull, Kingston, Lexington, Lincoln, Lynn, Malden, Medford, Needham, Norwood, Plympton, Randolph, Reading, Revere, Sharon, Stoughton, Waltham, Wellesley, Weymouth, Whitman; NOT Belmont & Watertown
216 330 OH: Hudson, Twinsburg, Aurora, Northfield [*] (realignment)
216 440 OH: Ashtabula, Elyria, Mentor, Cleveland suburbs
415 650 CA: San Mateo Co., Palo Alto, Mountain View, SFO Airport, Redwood City, “The Peninsula”
414 920 WI: Green Bay, Sheboygan, Oshkosh, Jefferson
913 785 KS: Topeka, Lawrence, Salina, Hays, Colby
210 956 TX: Laredo, Brownsville, Rio Grande Valley
210 830 TX: Kerrville, Seguin, Del Rio, Gonzales, Fredericksburg (but not metro San Antonio)
Int’l 670 🇲🇵 MP: Commonwealth of the Northern Mariana Islands (C.N.M.I.) (U.S.) (Saipan, Tinian)
Int’l 671 🇬🇺 GU: Guam (U.S.)
904 850 FL: Tallahassee, Pensacola, Perry, panhandle
818 626 CA: San Gabriel Valley (in Los Angeles Co.): Pasadena, Glendale, Covina, Monterey Park
809 868 🇹🇹 Trinidad & Tobago
809 340 🇻🇮 VI: U.S. Virgin Islands
908 732 NJ: New Brunswick, Rahway, Jersey shore
201 973 NJ: Newark, Paterson, Morristown, Newton
410 443 MD: Baltimore, Annapolis, Columbia, Salisbury
301 240 MD: Silver Spring, Frederick, Cumberland (First U.S. area code overlay)
809 649 🇹🇨 Turks & Caicos Islands
817 940 TX: Wichita Falls, Denton, Childress, Aspermont, Mineral Wells, Gainesville, Graham
817 254 TX: Waco, Cisco, Hillsboro, Breckenridge, Killeen, Mexia, Meridian, Stephenville, Cameron
810 248 MI: Royal Oak, Pontiac, Oakland County
809 876 🇯🇲 Jamaica
206 425 WA: Everett, Bellevue (east, north Seattle area)
206 253 WA: Tacoma, Kent (south Seattle area)
501 870 AR: Pine Bluff, Texarkana, West Memphis, Jonesboro, Batesville, Harrison, Arkadelphia
809 264 🇦🇮 Anguilla
619 760 CA: Escondido, Palm Springs, Bishop, Barstow, Lee Vining, north San Diego County, eastern Sierras
317 765 IN: Lafayette, Muncie, Richmond, Anderson, Kokomo, Lebanon, Martinsville, Greencastle
310 562 CA: Long Beach, Whittier, Norwalk
713 281 TX: Houston (outer fringes), Katy, Sugar Land (split reversed 1999-01-16)
604 250 🇨🇦 BC: Victoria, Kelowna, Kamloops, Prince George
312 773 IL: Chicago (uptown, airport)
809 869 🇰🇳 St. Kitts & Nevis
809 242 🇧🇸 Bahamas
513 937 OH: Dayton, Springfield, Hillsboro
214 972 TX: Dallas suburbs/exurbs, McKinney, Kaufman, Waxahachie, Italy; (split reversed 1998-12-05)
809 345 🇰🇾 Cayman Islands
708 630 IL: Aurora, Roselle, Hinsdale (not La Grange)
809 664 🇲🇸 Montserrat
804 757 VA: Virginia Beach, Norfolk, Chincoteague
809 246 🇧🇧 Barbados
809 758 🇱🇨 St. Lucia
407 561 FL: West Palm Beach, Boca Raton, Ft. Pierce
809 268 🇦🇬 Antigua & Barbuda
612 320 MN: St. Cloud, Alexandria, Little Falls
216 330 OH: Akron, Canton, Youngstown (see note)
809 787 🇵🇷 PR Puerto Rico
708 847 IL: Northbrook, Roselle, Skokie
314 573 MO: Columbia, Jefferson City, Cape Girardeau
904 352 FL: Gainesville, Ocala
803 864 SC: Greenville, Spartanburg, Saluda
503 541 OR: Eugene, Medford, Bend, Corvallis, The Dalles
809 441 🇧🇲 Bermuda
305 954 FL: Ft. Lauderdale, Broward County
615 423 TN: Knoxville, Chattanooga, Johnson City
203 860 CT: Hartford, Norwich, Litchfield
404 770 GA: Norcross, Smyrna, Tucker
703 540 VA: Roanoke, Fredericksburg
813 941 FL: Ft. Myers, Sarasota, Bradenton
303 970 CO: Grand Jct., Ft. Collins, Vail, Durango, Wiggins
602 520 AZ: Tucson, Flagstaff, Yuma, Prescott
206 360 WA: Olympia, Bellingham, Vancouver, Bremerton
205 334 AL: Montgomery, Mobile, Selma, Roanoke

For more recent splits, see the main area code split page.

Notes about the table

Permissive” refers to the date at which it became possible to use either the old or the new area code. For overlays, this column is left blank.

Mandatory” refers to the date at which it became 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. However, for overlays, this column shows the date on which numbers in the new overlay code became dialable. For overlays, this column shows the first date on which numbers could be assigned in the new area code.

After substantial public resistance to the idea of area code overlays, primarily because of the requirement to dial the area code on all calls, the tide has turned. The last area code split in the United States was in 2007–2008; the last split in Canada was in 1999. Indeed, Canada has officially announced that, barring exceptional circumstances, all future new area codes in Canada will be overlays. There are a few cases in the United States where a split might still be considered, but it is likely that most if not all new area codes will also be overlays.

Notes about specific area codes

Area code 456 was assigned for inbound international calls, particularly 56K ISDN data calls, where it was essential to connect the inbound call to a particular carrier’s network. However, by 2017 the need for such special routing had evaporated, so the 456 NPA has been discontinued. As of 2023, 456 is available for assignment as a general-purpose NPA.

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 (permissive), (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.)

nl: 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 , 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, inclusief oproepen van Sint Maarten naar Frans Saint-Martin. De andere Nederlandse eilanden in het Caribisch gebied niet veranderd. Sint Maarten is toegewezen ISO-landcode SX en de .sx Internet-domein.

fr: 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 ; à partir du , 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.

Area code 512 in central Texas was planned for a concentrated overlay in 2001, with Austin, Georgetown, and San Marcos in the 512 & 737 overlay, while outlying communities including Lampasas, Lockhart, Dripping Springs, Taylor, Bastrop, and Jarrell would have remained only in 512. However, the plan was shelved when number conservation efforts significantly extended the life of 512. The overlay was finally resurrected in 2012; it took effect as a general overlay of 737 on the entirety of 512.

Area code 216 (Cleveland, Ohio) split in 1996, with Akron, Canton, and Youngstown moving to the new area code 330. A second split took place on , with the lakefront outside of Cleveland moving to area code 440. At the same time, however, several communities between Cleveland and Akron switched from 216 to 330. The affected exchanges are Hudson, Twinsburg, Northfield, Aurora, Peninsula, and Richfield. There was a similar realignment of the 513/937 boundary between Cincinnati and Dayton, in mid-2001 in anticipation of the 513 & 283 overlay. The Franklin exchange realigned from 513 to 937 rather than becoming part of the overlay. (The 513 & 283 overlay has been postponed to about 2023, but 937 — including Franklin — had an overlay in 2020.)

The Dallas and Houston metropolitan areas in Texas had geographic splits in 1996. Both areas again ran out of numbers. In December 1998 and January 1999, the most recent split boundaries were officially “erased”; an additional area code was overlaid in each city in 1999, and a fourth area code was added in the Houston area in 2014.

State authorities in Pennsylvania cancelled the scheduled overlay of area code 412 (western Pennsylvania, including Pittsburgh) that was to take effect on . The reason for the reconsideration is that the original plan was to continue to allow local calls within the same area code to be dialed with only the 7-digit number, but FCC regulations require that the area code be dialed on all calls in an overlay area. Regulators decided on a conventional split, with Pittsburgh and some immediate suburbs retaining 412 and the rest of southwest Pennsylvania changing to 724. [back to table] However, in August 2001, the 412 and 724 area codes were reunited under the single 878 overlay, with 10-digit local dialing on all calls. However, as of , only 56 prefixes (out of nearly 800) in area code 878 are in use, with 13 more in the planning stages, suggesting that the 2001 overlay was more than a little premature.

The Commonwealth of the Northern Mariana Islands (CNMI) and Guam are U.S. territories in the Pacific Ocean. Each had a standard international country code assigned. Beginning on , and continuing permissively for one year, it was possible to dial these islands using either the old country code or a North American area code. From , only the new North American area code may be used. From within North America, these points must be dialed “1+” instead of “011+”; from outside North America, the country code “1” must be used. (Indeed, country code +670 has now been assigned for TL Timor-Leste/East Timor.) American Samoa changed from +684 to +1 684 in 2004, and there has been speculation that other Pacific islands might also join the NANP, but there has been no formal proposal to do so. However, on , the Dutch Caribbean island of Sint Maarten, formerly in country code +599, joined the NANP as area code 721; the French side of the same island remains in country code +590, and other islands in the Caribbean Netherlands (BES islands) and Curaçao remain in country code +599. Aruba remains in country code +297.

Louisiana: Mississippi River Delta: The original 504/985 split confined 504 to the immediate New Orleans metro area, but in 2007, the split was realigned to change the Mississippi River Delta back to 504. The (504) area code rate centers of Delacroix, Lake Catherine, St. Bernard, and Yscloskey merged into the New Orleans rate center. The (985) area code rate centers of Buras, Pointe-a-la-Hache, and Port Sulphur also merged into New Orleans/(504). The Venice rate center changed from (985) to (504). The (985) 358, 534, 564, 644, 687, and 814 prefixes reverted to (504); the (985) 238 and 333 prefixes changed to (504) but with new 7-digit local numbers.

Officials in Massachusetts, citing the rapidly diminishing supply of numbers in the greater Boston area, advanced the timetable for the splits of area codes 617 and 508, and then pushed back the mandatory date on two further occasions. The final dates are shown above. Note that the final mandatory date coincides with the originally planned permissive date! The state legislature also imprudently played politics with the split boundaries for the 617/781 split. First the suburbs of Watertown and Belmont were reinstated into 617 via a rider on an unrelated piece of legislation. Then ten other suburbs whined “Us, too!” to which the legislature caved in. The acting governor vetoed this lunacy, and, in fairness to the second set of suburbs, introduced a bill to return Watertown and Belmont to area code 781 as originally slated. That bill died in the state legislature; the splits have gone mandatory, with no indication that Watertown or Belmont will be reinstated into 781 where they belong. Had all twelve of these suburbs retained the 617 area code, another split of 617 would have been required in less than one year! As it stands, Massachusetts has already announced the next round of new area codes for 617 and 508 and their offspring, with overlays coming in April 2001. Each of the four area codes will receive a separate overlay code: 617 & 857, 781 & 339, 508 & 774, and 978 & 351. Massachusetts has a confusing mish-mash of rules for dialing numbers in overlay areas. In some cases, 1+ is required on a call that carries no toll, and in other cases 1+ is not required on a call that is charged at higher rates than calls within the same exchange.

For details of the multiple splits of the old area code 809 in the Caribbean, see the separate page.

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