| Old | New | Area Affected | Permissive | Mandatory | Test Number |
|---|---|---|---|---|---|
| 815 | 779 | IL: Rockford, Joliet (OVERLAY) | NONE | 2007-03-17 | 779-779-0000 |
| 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 | none |
| 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 | none |
| 630 | 331 | IL: Aurora, Hinsdale (OVERLAY) | NONE | 2007-10-07 | $331-330-0331 |
| 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 |
| 418 | 581 | QC: Québec city, Gaspé (OVERLAY) | NONE | 2008-09-19 | 581-510-TEST $581-510-BILL 581-610-TEST $581-610-BILL 581-710-TEST $581-710-BILL 581-810-TEST $581-810-BILL |
| 403 780 |
587 | AB: entire province (OVERLAY) (587 overlays both 403 [Calgary, southern] and 780 [Edmonton, northern]) | NONE | 2008-09-19 | 587-510-TEST $587-510-BILL 587-610-TEST $587-610-BILL 587-810-TEST $587-810-BILL |
| 714 | 657 | CA: Anaheim, northern Orange County (OVERLAY) | NONE | 2008-09-23 | 657-222-0002 657-222-0222 |
| 304 | 681 | WV: entire state (OVERLAY) | NONE | 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) | NONE | 2009-03-29 | 385-600-1234 |
| 818 | 747 | CA: San Fernando Valley (Los Angeles County) (OVERLAY) | NONE | 2009-05-18 | 747-222-TEST |
| 809 829 |
849 | Dominican Republic (OVERLAY) | NONE | 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 | NONE | 2009-12-12 | 475-288-0288 |
| 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. | NONE | 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! | NONE | 2009-11-07 | 872-872-1872 |
| 541 | 458 | OR: Eugene, Bend, Medford; all but the northwest corner (OVERLAY) (not Portland, Salem, Astoria) | NONE | 2010-02-10 | 458-222-TEST 458-333-TEST 458-444-TEST |
| 256 | 938 | AL: Huntsville, northern and east central (OVERLAY) | NONE | 2010-07-10 | 938-926-2222 938-946-4444 |
| 715 | 534 | WI: Eau Claire, northern/northwestern (OVERLAY) | NONE | 2010-08-14 | 534-534-1534 |
| 450 | 579 | QC: Laval, Longueuil, suburbs of Montréal (OVERLAY) | NONE | 2010-08-21 | $579-510-BILL 579-510-TEST $579-610-BILL 579-610-TEST $579-810-BILL 579-810-TEST |
| 613 | 343 | ON: Ottawa, eastern (OVERLAY) | NONE | 2010-09-17 | $343-510-BILL 343-510-TEST $343-610-BILL 343-610-TEST $343-810-BILL 343-810-TEST |
| — | 721 | Sint Maarten (Dutch side of the island of St. Martin in the Caribbean; changing from +599-5 to +1-721, or, calling from North America, from 011-599-5 to 1-721. The French side of the island will remain +590, or 011-590.) | 2010-05-31 | 2010-11-30 | t.b.a. |
| 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.) | NONE | 2011-01-31 | t.b.a. |
| 705 | 249 | ON: Sudbury, north central (OVERLAY) | NONE | 2011-01-31 | $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) | NONE | 2011-03-19 | 531-FOR-TEST (531-367-8378) 531-NEW-TEST (531-639-8378) |
| 920 | 274 | WI: Green Bay, northeastern (OVERLAY) | NONE | 2012-03-10 | 274-274-1274 |
| 270 | 364 | KY: Paducah, Henderson, Hopkinsville, westernmost tip (not Bowling Green, Owensboro) | 2012-01-01 | t.b.a. | 364-364-4444 |
| 870 | 327 | AR: Jonesboro, Pine Bluff, southern, eastern, north central (surrounds Little Rock on 3 sides) (OVERLAY) | NONE | 2013-05-18 | 327-327-1327 327-639-TEST |
| 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. |