| Old | New | Area Affected | Permissive | Mandatory |
|---|---|---|---|---|
| 843 | 854 | SC: Charleston, coastal areas | 2015-09-19 | 2015-10-19 |
| 500 etc. |
588 | expansion of 1-500 non-geographic services | — | 2015-09-09 |
| 305 | 786 | FL: Florida Keys; (305 & 786 is already an overlay for Miami/Dade County, but the Florida Keys, from Key Largo to Key West, have retained 7-digit local dialing with all numbers in area code 305. Numbers in area code 786 will be assigned also in the Keys beginning 2015‑06‑01. Mandatory 10-digit dialing of local calls in the Keys begins 2015‑04‑18.) | 2015-04-18 | 2015-06-01 |
| 740 | 220 | OH: Zanesville, Marion, southeastern | 2015-03-21 | 2015-04-22 |
| 615 | 629 | TN: Nashville, central and north central | 2015-02-28 | 2015-03-28 |
| 600 | 622 | CANADA: Non-geographic services in Canada only (expansion of 600) | — | 2015-03-23 |
| 415 | 628 | CA: San Francisco, Marin County; originally scheduled as an overlay for 2000‑10‑21! | 2015-02-21 | 2015-03-21 |
| 902 | 782 | NS & PE: Nova Scotia and Prince Edward Island (both provinces) | 2014-11-30 | 2014-11-30 |
| 812 | 930 | IN: Evansville, Terre Haute, Bloomington, southern | 2014-09-06 | 2014-10-06 |
| 860 | 959 | CT: Hartford, northern and eastern | — | 2014-08-30 |
| 713 281 832 |
346 | TX: Houston and suburbs | — | 2014-07-01 |
| 702 | 725 | NV: Las Vegas metro area | 2014-05-03 | 2014-06-03 |
| 500 etc. |
577 | expansion of 1-500 non-geographic services | — | 2014-03-28 |
| 270 | 364 | KY: westernmost tip | 2014-02-01 | 2014-03-03 |
| 800 etc. |
844 | New toll-free code | — | 2013-12-07 |
| 570 | 272 | PA: Scranton, Wilkes-Barre (Overlay) | — | 2013‑10‑21 |
| 512 | 737 | TX: Austin (Overlay) | — | 2013‑07‑01 |
| 604 250 778 |
236 | BC: British Columbia: entire province (Overlay) | — | 2013‑06‑01 |
| 306 | 639 | SK: Saskatchewan: entire province (Overlay) | — | 2013‑05‑25 |
| 416 647 |
437 | ON: city of Toronto (Overlay) | — | 2013‑03‑25 |
| 905 289 |
365 | ON: Mississauga, Hamilton, suburbs of Toronto (Overlay) | — | 2013‑03‑25 |
| 408 | 669 | CA: San Jose, "Silicon Valley" (Overlay) | — | 2012‑11‑20 |
| 204 | 431 | MB: entire province of Manitoba (Overlay) | — | 2012‑11‑03 |
| 819 | 873 | QC: Gatineau-Hull, Trois-Rivières, Kuujjuaq • south-central, western, and northern • centre-sud, ouest, et nord; (Overlay • Recouvrement) | — | 2012‑09‑15 |
| 919 | 984 | NC: Raleigh; (Overlay) | — | 2012‑04‑30 |
| 500 533 544 |
566 | expansion of 1‑500 non-geographic services | — | 2012‑04‑17 |
| 410 443 |
667 | MD: Baltimore, Annapolis, northeastern; (Overlay) | — | 2012‑03‑24 |
| 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 |
| 918 | 539 | OK: Tulsa, northeastern (Overlay) | — | 2011‑04‑01 |
| 402 | 531 | NE: Omaha, Lincoln, eastern (Overlay) | — | 2011‑03‑26 |
| 705 | 249 | ON: Sudbury, north central (Overlay) | — | 2011‑03‑19 |
| — | 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 |
| 500 533 |
544 | expansion of 1‑500 non-geographic services | — | 2010‑12‑15 |
| 800 etc. |
855 | New toll-free code | — | 2010-10-02 |
| 450 | 579 | QC: Laval, Longueuil, suburbs/banlieues of Montréal (Overlay • Recouvrement) | — | 2010‑08‑21 |
| 715 | 534 | WI: Eau Claire, northern/northwestern (Overlay) | — | 2010‑08‑14 |
| 256 | 938 | AL: Huntsville, northern and east central (Overlay) | — | 2010‑07‑10 |
| 613 | 343 | ON: Ottawa, eastern (Overlay) | — | 2010‑05‑17 |
| 541 | 458 | OR: Eugene, Bend, Medford; all but the northwest corner (Overlay) (not Portland, Salem, Astoria) | — | 2010‑02‑10 |
| 203 | 475 | CT: New Haven, Stamford, southwest corner (Overlay); ordered, postponed, re-postponed, and finally in effect! | — | 2009‑12‑12 |
| 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 |
| 312 773 |
872 | IL: Chicago (entire city) (Overlay); 312 and 773 retain their distinct geographic identities, but 872 overlays both | — | 2009‑11‑07 |
| 809 829 |
849 | Dominican Republic (Overlay • Superposición) | — | 2009‑07‑01 |
| 818 | 747 | CA: San Fernando Valley (Los Angeles County) (Overlay) | — | 2009‑05‑18 |
| 500 | 533 | expansion of 1‑500 non-geographic services | — | 2009‑Q2 |
| 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 |
| 304 | 681 | WV: entire state (Overlay) | — | 2009‑03‑28 |
| 714 | 657 | CA: Anaheim, northern Orange County (Overlay) | None | 2008‑09‑23 |
| 403 780 |
587 | AB: entire province (Overlay) (587 overlays both 403 [Calgary, southern] and 780 [Edmonton, northern]) | None | 2008‑09‑19 |
| 418 | 581 | QC: Québec city, Gaspé (Overlay • Recouvrement) | none | 2008‑09‑19 |
| 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.) | none | 2008‑04‑27 |
| 505 | 575 | NM: Las Cruces, Roswell, Taos (not Albuquerque, Santa Fe, Farmington) (Last U.S. area code split) | 2007‑10‑07 | 2008‑10‑05 |
| 630 | 331 | IL: Aurora, Hinsdale (Overlay) | None | 2007‑10‑07 |
| 985 | 504 | LA: Lower Plaquemines Parish and the Mississippi River Delta (Realignment) (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.) | 2007‑07‑29 | 2008‑05‑01 |
| 604 250 |
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.) | None | 2007‑07‑04 |
| 815 | 779 | IL: Rockford, Joliet (Overlay) | None | 2007‑03‑17 |
| 514 | 438 | QC: Montréal (Overlay • Recouvrement) | none | 2006‑10‑28 |
| 519 | 226 | ON: southwestern peninsula, London, Windsor (Overlay) | none | 2006‑10‑28 |
| 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.) | none | 2006‑08‑26 |
| 706 | 762 | GA: northern Georgia except Atlanta metro area (Overlay) | none | 2006‑05‑16 |
| 809 | 829 | Dominican Republic (Overlay • Superposición) (First NANP area code overlay outside US & Canada) | none | 2005‑10‑01 |
| 601 | 769 | MS: Jackson, central (Overlay) | none | 2005‑04‑18 |
| ∗ | 684 | AS American Samoa: entire territory; changed from country code +684 (i.e., 011–684) to area code +1 684 (i.e., 1–684) | 2004‑10‑02 | 2005‑04‑02 |
| 909 | 951 | CA: Riverside and western Riverside County | 2004‑07‑17 | 2004‑10‑30 |
| 903 | 430 | TX: Tyler, northeast (Overlay) | none | 2003‑04‑28 |
| 915 | 432 | TX: Midland, Odessa; (El Paso keeps 915) | 2003‑04‑05 | 2003‑10‑04 |
| 915 | 325 | TX: Abilene, San Angelo | 2003‑04‑05 | 2003‑10‑04 |
| 248 | 947 | MI: Oakland County (overlay, reinstated by MPSC, then postponed) | none | 2002‑09‑07 |
| 616 | 269 | MI: Kalamazoo, Battle Creek; (Grand Rapids keeps 616) | 2002‑07‑13 | 2003‑02‑15 |
| 941 | 239 | FL: Lee and Collier Counties, plus the mainland portion of Monroe County (Everglades); Ft. Myers and Naples | 2002‑03‑11 | 2003‑03‑10 |
| 561 | 772 | FL: Martin, St. Lucie, and Indian River Counties; Ft. Pierce, Sebastian | 2002-02-11 | 2002‑11‑11 |
| 501 | 479 | AR: Fort Smith, Fayetteville, northwest (Note: split boundary changed from original announcement.) | 2002‑01‑19 | 2002‑07‑20 |
| 219 | 574 | IN: South Bend, north central (Note: La Porte stayed 219, rather than splitting to 574 as originally planned.) | 2002‑01‑15 | 2002‑06‑14 |
| 219 | 260 | IN: Fort Wayne, northeastern, including Ligonier and Cromwell | 2002‑01‑15 | 2002‑06‑14 |
| 847 | 224 | IL: northern suburbs of Chicago (Overlay) | none | 2002‑01‑05 |
| 419 | 567 | OH: Toledo, northwest (Overlay) | none | 2002‑01‑01 |
| 973 | 862 | NJ: Newark, Morristown (overlay) (note: new code originally announced as 356, but changed to 862) | none | 2001‑12‑29 |
| 732 | 848 | NJ: New Brunswick, northern Jersey Shore (Overlay) | none | 2001‑12‑29 |
| 201 | 551 | NJ: Hackensack, Jersey City (Overlay) | none | 2001‑12‑29 |
| 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 change to 585.) | 2001‑11‑15 | 2002‑08‑17 |
| 604 | 778 | BC: Vancouver metro area, Abbotsford, Mission (concentrated overlay excluding Hope, Chilliwack, Powell River, other areas away from Vancouver metro) (The overlay was later expanded to all of 604, and then expanded again to cover the entire province, both 604 and 250.) | none | 2001‑11‑03 |
| 954 | 754 | FL: Ft. Lauderdale, Broward County (Overlay) | none | 2001-09-23 |
| 810 | 586 | MI: Macomb County (Warren) (was to be an overlay, changed to a split) | 2001‑09‑22 | 2002‑03‑23 |
| 787 | 939 | PR: Puerto Rico (entire island) (Overlay) | none | 2001‑09‑15 |
| 404 770 678 |
470 | GA: Atlanta area (Overlay) | none | 2001‑09‑02 |
| 540 | 276 | VA: southwestern corner (Note: further split of Roanoke from area 540, originally scheduled for 2005, postponed indefinitely.) | 2001-09-01 | 2002-03-16 |
| 520 | 928 | AZ: Flagstaff, Yuma, most of the state (everything but metro Phoenix (602/480/623) and the southeast corner (Tucson, Nogales retain 520)) | 2001‑06‑23 | 2002‑01‑06 |
| 334 | 251 | AL: Mobile, southwestern | 2001‑06‑18 | 2002‑01‑07 |
| 905 | 289 | ON: Toronto suburbs, Niagara Falls (Overlay) | none | 2001‑06‑09 |
| 804 | 434 | VA: Charlottesville, Lynchburg, Danville, Emporia | 2001‑06‑01 | 2002‑01‑15 |
| 517 | 989 | MI: Saginaw, northeast lower Michigan (split plan reinstated by MPSC) | 2001‑04‑07 | 2001‑10‑06 |
| 978 | 351 | MA: northeast (Overlay) | none | 2001‑04‑02 |
| 781 | 339 | MA: outer suburbs of Boston (Overlay) | none | 2001‑04‑02 |
| 617 | 857 | MA: Boston (Overlay) | none | 2001‑04‑02 |
| 508 | 774 | MA: Worcester, Cape Cod, southeast (Overlay) | none | 2001‑04‑02 |
| 704 | 980 | NC: Charlotte area (Overlay) | none | 2001‑04‑01 |
| 319 | 563 | IA: Dubuque, Davenport/Quad Cities, Clinton, Decorah | 2001‑03‑25 | 2001‑12‑02 |
| 416 | 647 | ON: city of Toronto (all 6 boroughs) (Overlay) (First Canadian area code overlay) | none | 2001‑03‑05 |
| 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.) | 2001‑02‑15 | 2001‑11‑05 |
| 904 | 386 | FL: the areas west and south of metro Jacksonville (Lake City, Live Oak, Daytona Beach, Palatka) | 2001‑02‑15 | 2001‑11‑05 |
| 901 | 731 | TN: western, except Memphis | 2001‑02‑12 | 2001‑09‑17 |
| 504 | 985 | LA: southeast except New Orleans (504) and Baton Rouge (225) | 2001‑02‑12 | 2001‑10‑22 |
| 316 | 620 | KS: southern Kansas except Wichita | 2001‑02‑03 | 2001‑11‑03 |
| 330 | 234 | OH: Akron, Canton, Youngstown (Overlay) | none | 2000‑10‑30 |
| 817 | 682 | TX: Fort Worth area (Overlay) | none | 2000‑10‑07 |
| 503 | 971 | OR: Portland, Salem, but not Tillamook, Astoria; (originally a concentrated overlay, excluding Tillamook & Astoria; expanded in 2008) | none | 2000‑10‑01 |
| 912 | 478 | GA: Macon, central | 2000‑08‑01 | 2001‑08‑01 |
| 912 | 229 | GA: Albany, Valdosta, southwestern | 2000‑08‑01 | 2001‑08‑01 |
| new | 866 | New toll-free code | n/a | 2000‑07‑29 |
| 515 | 641 | IA: Mason City, Marshalltown, Oskaloosa, Ottumwa, Creston, Guthrie Center | 2000‑07‑09 | 2000‑12‑03 |
| 914 | 845 | NY: Poughkeepsie, Monticello, Newburgh, New City, all of 914 except Westchester County | 2000‑06‑05 | 2000‑12‑09 |
| 606 | 859 | KY: Lexington, Covington, suburbs of Cincinnati OH (Note: 859=U.Ky.) | 2000‑04‑01 | 2000‑10‑01 |
| 703 | 571 | VA: Arlington, Washington suburbs (Overlay) | none | 2000‑03‑01 |
| 612 | 952 | MN: Bloomington, southwestern suburbs of Minneapolis | 2000‑02‑27 | 2001‑01‑14 |
| 612 | 763 | MN: Brooklyn Park, northwestern suburbs of Minneapolis | 2000‑02‑27 | 2001‑01‑14 |
| 409 | 979 | TX: Bryan/College Station, Wharton, Bay City, southeast Texas west of Houston | 2000‑02‑19 | 2000‑08‑05 |
| 409 | 936 | TX: Nacogdoches, Lufkin, Huntsville, east Texas north of Houston | 2000‑02‑19 | 2000‑08‑05 |
| 407 | 321 | FL: Orlando, Kissimmee, not Melbourne, Titusville; (overlay, in a bizarre combination with a split) | none | 1999‑12‑01 |
| 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) | 1999‑11‑01 | 2000‑10‑01 |
| 423 | 865 | TN: Knoxville area (not Chattanooga, not Johnson City) (Note: 865=VOL for U.Tenn. Volunteers) | 1999‑11‑01 | 2000‑04‑24 |
| 516 | 631 | NY: Suffolk County (eastern Long Island) | 1999‑11‑01 | 2000‑04‑01 |
| 318 | 337 | LA: Lafayette, Lake Charles, southwestern | 1999‑10‑11 | 2000‑07‑10 |
| 718 | 347 | NY: New York City (Bronx, Brooklyn, Queens, Staten Island; not Manhattan) (Overlay) | none | 1999‑10‑01 |
| 414 | 262 | WI: Racine, Kenosha, Waukesha, West Bend, Lake Geneva (not Milwaukee) | 1999‑09‑25 | 2000‑03‑04 |
| 941 | 863 | FL: Lakeland, Okeechobee | 1999‑09‑20 | 2000‑05‑22 |
| 212 | 646 | NY: New York City (Manhattan only) (Overlay) | none | 1999‑07‑09 |
| 214 972 |
469 | TX: Dallas (inner and outer) (Overlay) | none | 1999‑07‑01 |
| 610 | 484 | PA: Allentown, Bethlehem, Reading, Pottstown, Norristown, King of Prussia, Coatesville, Bangor, Bethel (Overlay) | none | 1999‑07‑01 |
| 215 | 267 | PA: Philadelphia, Bucks County, Kulpsville (Overlay) | none | 1999‑07‑01 |
| 619 | 858 | CA: near north suburbs of San Diego (La Jolla, Poway, Rancho Bernardo, Rancho Santa Fe) (Split will be erased in a "boundary elimination overlay," effective 2018‑Q3 [exact date t.b.a.], creating the 619 & 858 overlay.) | 1999‑06‑12 | 1999‑12‑11 |
| 609 | 856 | NJ: Camden, Vineland, southwestern | 1999‑06‑12 | 1999‑11‑13 |
| 616 | 231 | MI: NW lower peninsula; Muskegon, Traverse City | 1999‑06‑05 | 1999‑10‑02 |
| 314 | 636 | MO: St. Charles, Chesterfield, Union [*] | 1999‑05‑22 | 2000‑02‑26 |
| 601 | 662 | MS: northern half, Greenville, Tupelo | 1999‑04‑19 | 2000‑05‑01 |
| 502 | 270 | KY: Bowling Green, Paducah, Owensboro, western | 1999‑04‑19 | 1999‑11‑01 |
| 602 | 623 | AZ: Glendale, Peoria, Sun City, "West Valley" Phoenix area | 1999‑04‑01 | 1999‑09‑01 |
| 602 | 480 | AZ: Scottsdale, Mesa, "East Valley" Phoenix area | 1999‑04‑01 | 1999‑09‑01 |
| 502 | 270 | KY: Louisville, western half (Overlay changed to split) [*] | cancelled | cancelled |
| 512 | 361 | TX: Corpus Christi, Victoria, Kingsville [*] | 1999‑02‑13 | 1999‑09‑18 |
| 805 | 661 | CA: Bakersfield, Earlimart, Lancaster, northern Los Angeles County | 1999‑02‑13 | 1999‑08‑14 |
| 403 | 780 | AB: Edmonton, Wetaskiwin, Grande Prairie, Jasper, Fort McMurray, Lloydminster, Camrose, northern [*] (Last Canadian area code split) | 1999‑01‑25 | 1999-05-18 |
| 713 281 |
832 | TX: Houston (inner and outer) (overlay, reversing the previous split and adding a third code) | none | 1999‑01‑16 |
| 702 | 775 | NV: Reno, Carson City, Elko, Ely, everything except most of Clark County (Las Vegas) | 1998‑12‑12 | 1999‑05‑15 |
| 214 972 |
214 972 |
TX: Dallas, Plano, Richardson, Irving, Grand Prairie, Waxahachie, McKinney, Kaufman, Garland, Duncanville, Lewisville (overlay, erasing previous split) | none | 1998‑12‑05 |
| 717 | 570 | PA: Scranton, Wilkes-Barre, Williamsport, Stroudsburg, Selinsgrove, Pottsville, Hazleton | 1998‑12‑05 | 1999‑04‑08 |
| 209 | 559 | CA: Fresno, Madera, Chowchilla, Tulare, Coalinga, Porterville, Visalia, Kings Canyon/Sequoia N.P.s | 1998‑11‑14 | 1999‑05‑15 |
| 813 | 727 | FL: Tampa Bay area. Overlay changed to split. (see revised data above) | 1998-10-01 (cancelled) |
(N/A) |
| 303 | 720 | CO: Denver metropolitan area (Overlay) | none | 1998‑09‑01 |
| 504 | 225 | LA: Baton Rouge, New Roads, Donaldsonville | 1998‑08‑17 | 1999‑04‑05 |
| 612 | 651 | MN: St. Paul, eastern portion of Twin Cities area | 1998‑07‑12 | 1999‑01‑10 |
| 408 | 831 | CA: Salinas, Santa Cruz, Monterey, Hollister, King City | 1998‑07‑11 | 1999‑02‑20 |
| 813 | 727 | FL: St. Petersburg, Clearwater, Dunedin, Port Richey, Pinellas County and western Pasco County | 1998‑07‑01 | 1999‑02‑01 |
| 305 | 786 | FL: Miami, Dade County (concentrated overlay, did not affect Florida Keys, which retained 305 only until 2015) | none | 1998‑07‑01 |
| 514 | 450 | Québec: Laval, Longueuil, St.-Lambert, Joliette, Granby, St.-Hyacinthe, Lachute; (surrounds but does not include Montréal) | 1998‑06‑13 | 1999‑01‑16 |
| 213 | 323 | CA: Los Angeles outer downtown "doughnut" (Split will be erased in a "boundary elimination overlay," effective 2017‑08‑01, creating the 213 & 323 overlay.) | 1998‑06‑13 | 1999‑01‑16 |
| 809 | 784 | St. Vincent & the Grenadines (Note: With the completion of this split, area code 809 now serves only the Dominican Republic.) | 1998‑06‑01 | 1999‑05‑31 |
| 714 | 949 | CA: Irvine, southern Orange County | 1998‑04‑18 | 1998‑10‑17 |
| 205 | 256 | AL: Huntsville, Anniston, Decatur, Gadsden, Talladega, northern/northeastern areas | 1998‑03‑23 | 1998‑09‑28 |
| 919 | 252 | NC: Greenville, Rocky Mount, Kinston, Henderson, Morehead City, Cape Hatteras region | 1998‑03‑22 | 1998‑10‑05 |
| 803 | 843 | SC: Charleston, Florence, Walterboro, coastal areas | 1998‑03‑22 | 1998‑09‑27 |
| 704 | 828 | NC: Asheville, Hickory, Boone, western tip | 1998‑03‑22 | 1998‑09‑21 |
| 510 | 925 | CA: Walnut Creek, Livermore, San Ramon, Concord | 1998‑03‑14 | 1998‑09‑12 |
| 412 | 724 | PA: Sharon, New Castle, Kittanning, Uniontown, Indiana, Latrobe, McCandless (not Pittsburgh) [*] | 1998‑02‑01 | 1998‑04‑30 |
| 404 770 |
678 | GA: Atlanta region (includes Atlanta, Marietta, Norcross, Smyrna) (overlays both 404 & 770) | none | 1998‑01‑06 |
| 910 | 336 | NC: Greensboro, Winston-Salem, Asheboro, Burlington, Roxboro (Note: some areas remained in 910 until permissive date of 1998-03-22.) | 1997-12-15 1998-03-22 |
1998‑06‑15 |
| 313 | 734 | MI: Ann Arbor, Monroe (see note on Livonia) | 1997‑12‑13 | 1998‑07‑25 |
| 614 | 740 | OH: Lancaster, Zanesville, Newark, Steubenville | 1997‑12‑06 | 1998‑06‑06 |
| 916 | 530 | CA: Chico, Redding, Lake Tahoe, Yuba City, Yreka | 1997‑11‑01 | 1998‑05‑16 |
| 405 | 580 | OK: Lawton, Enid, Ponca City, Ardmore, Ada, Hugo, Idabel, Weatherford, Clinton, Guymon | 1997‑11‑01 | 1998‑04‑01 |
| 809 | 473 | Grenada & Carriacou | 1997‑10‑31 | 1998‑10‑31 |
| 403 819 |
867 | Yukon, Nunavut, Northwest Territories | 1997‑10‑21 | 1998‑04‑26 |
| 816 | 660 | MO: Sedalia, Marshall, Maryville, Butler, Moberly, Alexandria, Boonville, Clinton, Warsaw | 1997‑10‑12 | 1998‑04‑19 |
| 916 | 707 | CA: Dixon (Realignment) | 1997‑10‑04 | 1998‑05‑16 |
| 809 | 767 | Dominica | 1997‑10‑01 | 1998‑09‑30 |
| 809 | 284 | British Virgin Islands | 1997‑10‑01 | 1998‑09‑30 |
| 801 | 435 | UT: Logan, Tooele, Nephi, Price, Moab | 1997‑09‑21 | 1998‑09‑20 |
| 601 | 228 | MS: Biloxi, Gulfport, Pascagoula, Bay St. Louis, Hurley (extreme south) | 1997‑09‑15 | 1998‑09‑14 |
| 615 | 931 | TN: Clarksville, Columbia, Cookeville, Dover, Erin, McMinnville, Sparta, middle TN except Nashville | 1997‑09‑15 | 1998‑01‑19 |
| 508 | 978 | MA: Lowell, Methuen, Andover, Athol, Barre, Berlin, Billerica, Carlisle, Concord, Gloucester, Groton, Leominster, New Salem, North Reading, Peabody, Salem, Sterling, Sudbury, Wendell | 1997‑09‑01 | 1998‑02‑01 |
| 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 | 1997‑09‑01 | 1998‑02‑01 |
| 216 | 330 | OH: Hudson, Twinsburg, Aurora, Northfield [*] (Realignment) | 1997‑08‑16 | 1998‑04‑04 |
| 216 | 440 | OH: Ashtabula, Elyria, Mentor, Cleveland suburbs | 1997‑08‑16 | 1998‑04‑04 |
| 415 | 650 | CA: San Mateo Co., Palo Alto, Mountain View, SFO Airport, Redwood City, "The Peninsula" | 1997‑08‑02 | 1998‑01‑31 |
| 414 | 920 | WI: Green Bay, Sheboygan, Oshkosh, Jefferson | 1997‑07‑26 | 1997‑10‑25 |
| 913 | 785 | KS: Topeka, Lawrence, Salina, Hays, Colby | 1997‑07‑20 | 1998‑10‑01 |
| 210 | 956 | TX: Laredo, Brownsville, Rio Grande Valley | 1997‑07‑07 | 1997‑10‑06 |
| 210 | 830 | TX: Kerrville, Seguin, Del Rio, Gonzales, Fredericksburg (but not metro San Antonio) | 1997‑07‑07 | 1997‑10‑06 |
| Int'l | 671 | GU: Guam (U.S.) | 1997‑07‑01 | 1998‑07‑01 |
| Int'l | 670 | MP: Commonwealth of the Northern Mariana Islands (C.N.M.I.) (U.S.) (Saipan, Tinian) | 1997‑07‑01 | 1998‑07‑01 |
| 904 | 850 | FL: Tallahassee, Pensacola, Perry, panhandle | 1997‑06‑23 | 1998‑03‑23 |
| 818 | 626 | CA: San Gabriel Valley (in Los Angeles Co.): Pasadena, Glendale, Covina, Monterey Park | 1997‑06‑14 | 1998‑02‑21 |
| 809 | 868 | Trinidad & Tobago | 1997‑06‑01 | 1998‑05‑31 |
| 809 | 340 | VI: U.S. Virgin Islands | 1997‑06‑01 | 1997‑12‑06 |
| 908 | 732 | NJ: New Brunswick, Rahway, Jersey shore | 1997‑06‑01 | 1997‑12‑06 |
| 201 | 973 | NJ: Newark, Paterson, Morristown, Newton | 1997‑06‑01 | 1997‑12‑06 |
| 410 | 443 | MD: Baltimore, Annapolis, Columbia, Salisbury (Overlay) | none | 1997‑06‑01 |
| 301 | 240 | MD: Silver Spring, Frederick, Cumberland (Overlay) (First U.S. area code overlay) | none | 1997‑06‑01 |
| 809 | 649 | Turks & Caicos Islands | 1997‑05‑31 | 1998‑06‑30 |
| 817 | 940 | TX: Wichita Falls, Denton, Childress, Aspermont, Mineral Wells, Gainesville, Graham | 1997‑05‑25 | 1997‑08‑24 |
| 817 | 254 | TX: Waco, Cisco, Hillsboro, Breckenridge, Killeen, Mexia, Meridian, Stephenville, Cameron | 1997‑05‑25 | 1997‑08‑24 |
| 810 | 248 | MI: Royal Oak, Pontiac, Oakland County | 1997‑05‑10 | 1997‑09‑13 |
| 809 | 876 | Jamaica | 1997‑05‑01 | 1998‑07‑31 |
| 206 | 425 | WA: Everett, Bellevue (east, north Seattle area) | 1997‑04‑27 | 1997‑11‑16 |
| 206 | 253 | WA: Tacoma, Kent (south Seattle area) | 1997‑04‑27 | 1997‑11‑16 |
| 501 | 870 | AR: Pine Bluff, Texarkana, West Memphis, Jonesboro, Batesville, Harrison, Arkadelphia | 1997‑04‑14 | 1997‑10‑06 |
| 809 | 264 | Anguilla | 1997‑03‑31 | 1997‑09‑30 |
| 619 | 760 | CA: Escondido, Palm Springs, Bishop, Barstow, Lee Vining, north San Diego County, eastern Sierras | 1997‑03‑22 | 1997‑09‑27 |
| 317 | 765 | IN: Lafayette, Muncie, Richmond, Anderson, Kokomo, Lebanon, Martinsville, Greencastle | 1997‑02‑01 | 1997‑06‑28 |
| 310 | 562 | CA: Long Beach, Whittier, Norwalk | 1997‑01‑25 | 1997‑07‑26 |
| 713 | 281 | TX: Houston (outer fringes), Katy, Sugar Land (split reversed 1999-01-16) | 1996‑11‑02 | 1997‑06‑06 |
| 604 | 250 | BC: Victoria, Kelowna, Kamloops, Prince George | 1996‑10‑19 | 1997‑04‑06 |
| 312 | 773 | IL: Chicago (uptown, airport) | 1996‑10‑12 | 1997‑01‑11 |
| 809 | 869 | St. Kitts & Nevis | 1996‑10‑01 | 1997‑03‑31 |
| 809 | 242 | Bahamas | 1996‑10‑01 | 1997‑03‑31 |
| 513 | 937 | OH: Dayton, Springfield, Hillsboro | 1996‑09‑28 | 1997‑06‑14 |
| 214 | 972 | TX: Dallas suburbs/exurbs, McKinney, Kaufman, Waxahachie, Italy; (split reversed 1998-12-05) | 1996‑09‑14 | 1997‑04‑18 |
| 809 | 345 | Cayman Islands | 1996‑09‑01 | 1997‑08‑31 |
| 708 | 630 | IL: Aurora, Roselle, Hinsdale (not La Grange) | 1996‑08‑03 | 1996‑11‑30 |
| 809 | 664 | Montserrat | 1996‑07‑01 | 1997‑06‑01 |
| 804 | 757 | VA: Virginia Beach, Norfolk, Chincoteague | 1996‑07‑01 | 1997‑02‑01 |
| 809 | 246 | Barbados | 1996‑07‑01 | 1997‑01‑15 |
| 809 | 758 | St. Lucia | 1996‑07‑01 | 1997‑01‑01 |
| 407 | 561 | FL: West Palm Beach, Boca Raton, Ft. Pierce | 1996‑05‑13 | 1997‑04‑13 |
| 809 | 268 | Antigua & Barbuda | 1996‑04‑01 | 1997‑03‑31 |
| 612 | 320 | MN: St. Cloud, Alexandria, Little Falls | 1996‑03‑17 | 1996‑09‑15 |
| 216 | 330 | OH: Akron, Canton, Youngstown (see note) | 1996‑03‑09 | 1996‑06‑29 |
| 809 | 787 | PR Puerto Rico | 1996‑03‑01 | 1997‑01‑31 |
| 708 | 847 | IL: Northbrook, Roselle, Skokie | 1996‑01‑20 | 1996‑04‑20 |
| 314 | 573 | MO: Columbia, Jefferson City, Cape Girardeau | 1996‑01‑07 | 1996‑07‑07 |
| 904 | 352 | FL: Gainesville, Ocala | 1995‑12‑03 | 1996‑05‑20 |
| 803 | 864 | SC: Greenville, Spartanburg, Saluda | 1995‑12‑03 | 1996‑05‑01 |
| 503 | 541 | OR: Eugene, Medford, Bend, Corvallis, The Dalles | 1995‑11‑05 | 1996‑06‑30 |
| 809 | 441 | Bermuda | 1995‑10‑01 | 1996‑09‑30 |
| 305 | 954 | FL: Ft. Lauderdale, Broward County | 1995‑09‑11 | 1996‑08‑01 |
| 615 | 423 | TN: Knoxville, Chattanooga, Johnson City | 1995‑09‑11 | 1996‑02‑26 |
| 203 | 860 | CT: Hartford, Norwich, Litchfield | 1995‑08‑28 | 1996‑10‑04 |
| 404 | 770 | GA: Norcross, Smyrna, Tucker | 1995‑08‑01 | 1995‑12‑01 |
| 703 | 540 | VA: Roanoke, Fredericksburg | 1995‑07‑15 | 1996‑01‑27 |
| 813 | 941 | FL: Ft. Myers, Sarasota, Bradenton | 1995‑05‑28 | 1996‑03‑03 |
| 303 | 970 | CO: Grand Jct., Ft. Collins, Vail, Durango, Wiggins | 1995‑04‑02 | 1996‑01‑14 |
| 602 | 520 | AZ: Tucson, Flagstaff, Yuma, Prescott | 1995‑03‑19 | 1995‑10‑21 |
| 206 | 360 | WA: Olympia, Bellingham, Vancouver, Bremerton | 1995‑01‑15 | 1995‑08‑20 |
| 205 | 334 | AL: Montgomery, Mobile, Selma, Roanoke | 1995-01-15 | 1995-05-13 |
For more recent splits, see the main area code split page.