# List of area code overlays

An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) that has multiple area codes assigned. Overlay complexes are used to add central office prefixes in an NPA to increase the number of available telephone numbers.
| Overlay area codes | Overlay area codes | Location | Notes |
| Added | Base | Location | Notes |
| 557 | 314 | St. Louis, Missouri (communities such as, but not limited to, St. Louis, Overland, Bridgeton, Florissant, Webster Groves, Creve Coeur, Kirkwood and Sappington) | Initial overlay area code plan was announced October 24, 2000. New 557 area code was announced in February 2022 and went into effect August 12, 2022. https://en.wikipedia.org/wiki/Area_codes_314_and_557 |
| 324 | 904 | Jacksonville, Jacksonville Beach, Fernandina Beach, Orange Park and surrounding communities | |
| 220 | 740 | Central and southeastern Ohio | |
| 223 | 717 | South Central Pennsylvania | |
| 224 | 847 | Northern suburbs of Chicago, Illinois | |
| 226, 382, 548 | 519 | Southwestern Ontario | |
| 234 | 330 | Akron-Canton and Warren-Youngstown areas in Ohio | |
| 236, 672, 778 | 604, 250 | British Columbia | |
| 227, 240 | 301 | Washington, D.C. suburbs and panhandle of Maryland | |
| 249 | 705 | Northeastern and central Ontario | |
| 267, 445 | 215 | Philadelphia, Pennsylvania area and a small portion of its Pennsylvania suburbs | |
| 272 | 570 | Northeastern Pennsylvania, including the cities of Scranton, Wilkes-Barre, and Williamsport | |
| 279 | 916 | Sacramento, California and surrounding suburbs | |
| 281, 346, 832 | 713 | Greater Houston, Texas | |
| 289, 365 | 905 | Golden Horseshoe region of Ontario, including suburban Toronto, Hamilton, Oshawa, and the Niagara Peninsula in Ontario | |
| 321 | 407 | Central Florida | In addition to being the sole area code in the Space Coast region around the Kennedy Space Center, this is the only partial overlay area code in North America |
| 323 | 213 | Central Los Angeles, incl. Downtown L.A. and Hollywood | |
| 326 | 937 | Southwest Ohio | |
| 331 | 630 | Western suburbs of Chicago | |
| 332, 646 , 917 | 212 | New York City borough of Manhattan, except for the Marble Hill neighborhood, which is physically connected to The Bronx and uses 718 | |
| 339 | 781 | Suburban Boston, Massachusetts and most of the South Shore region | |
| 341 | 510 | San Francisco East Bay | |
| 343 | 613 | Ottawa and eastern Ontario | |
| 347, 929 | 718 | New York City boroughs of The Bronx, Brooklyn, Queens, and Staten Island, as well as Marble Hill, a Manhattan neighborhood directly connected to The Bronx | |
| 351 | 978 | North-central and most of northeastern Massachusetts | |
| 364 | 270 | Western half of Kentucky, including the Purchase area, the Western Coal Fields, and most of the Pennyrile | |
| 367, 581 | 418 | Eastern Quebec | |
| 368, 587, 825 | 780, 403 | Alberta | |
| 380 | 614 | Columbus, Ohio, and suburbs | |
| 385 | 801 | Along the Wasatch Front of Utah, including Salt Lake City, Provo–Orem, and Ogden | |
| 424 | 310 | Southwestern Los Angeles County, California | |
| 430 | 903 | Northeastern Texas | |
| 431 | 204 | Manitoba | |
| 437, 647 | 416 | Toronto, Ontario | |
| 438 | 514 | Island of Montreal, Quebec | |
| 442 | 760 | Southeastern California | |
| 443, 667 | 410 | Baltimore metropolitan area and the Eastern Shore of Maryland | |
| 447 | 217 | Central Illinois | |
| 448 | 850 | Florida Panhandle, including Tallahassee and Pensacola | |
| 458 | 541 | Most of Oregon, excluding its northwestern part | |
| 464 | 708 | Near western suburbs and southern suburbs of Chicago | |
| 469, 972 | 214 | Eastern portion of the Dallas–Fort Worth metroplex in and around Dallas, Texas | |
| 470, 678 | 404, 770 | Atlanta metropolitan area, Georgia | |
| 474 | 306 | Saskatchewan | |
| 475 | 203 | Southwestern Connecticut | |
| 484 | 610 | Eastern and parts of southeastern Pennsylvania | |
| 531 | 402 | Eastern Nebraska | |
| 534 | 715 | Northern Wisconsin | |
| 539 | 918 | Northeastern Oklahoma | |
| 551 | 201 | Northeastern New Jersey | |
| 564 | 360 | Western Washington | 564 initially overlays only 360, but will expand to overlay 206, 253, and 425 as those area codes run out of numbers |
| 567 | 419 | Northwestern Ohio, including Toledo and Lima | |
| 571 | 703 | Northern Virginia | |
| 572 | 405 | Central Oklahoma, including greater Oklahoma City | |
| 582 | 814 | Central and western Pennsylvania, including Altoona, DuBois, and Erie | |
| 587 | 403, 780 | Alberta | |
| 628 | 415 | San Francisco, Marin County and small portions of San Mateo County | |
| 629 | 615 | Nashville, Tennessee | |
| 639 | 306 | Saskatchewan | |
| 640 | 609 | Central and southeast New Jersey | |
| 657 | 714 | Northern Orange County, California | |
| 658 | 876 | Jamaica | |
| 659 | 205 | Western and central Alabama | |
| 669 | 408 | Southern Bay Area in California, encompassing much of Santa Clara County and Silicon Valley | |
| 672 | 604, 250 | British Columbia | |
| 680 | 315 | An area of Upstate New York including parts of Central New York and the North Country, with Syracuse as the main city in the region | |
| 681 | 304 | West Virginia | |
| 682 | 817 | Western part of the Dallas–Fort Worth metroplex, in and around Fort Worth, Texas | |
| 689 | 407 | Orlando, Florida | |
| 720, 983 | 303 | Denver metropolitan area, Colorado | |
| 725 | 702 | Clark County, Nevada | |
| 726 | 210 | San Antonio, Texas | |
| 737 | 512 | Austin, Texas | |
| 743 | 336 | Piedmont Triad, North Carolina including Greensboro, Winston-Salem, and western areas of the Raleigh-Durham metropolitan area. | |
| 747 | 818 | San Fernando Valley, California | |
| 754 | 954 | Broward County, Florida | |
| 769 | 601 | Central Mississippi | |
| 771 | 202 | Washington, D.C. | |
| 774 | 508 | South-central and most of southeastern Massachusetts, including Cape Cod and the Islands | |
| 778 | 604, 250 | British Columbia | |
| 779 | 815 | Northern and north-central Illinois, including the Rockford, Freeport, and Kankakee areas | |
| 782 | 902 | Nova Scotia and Prince Edward Island on 30 November 2014 | |
| 786, 645 | 305 | Miami-Dade County, Florida and the Florida Keys | |
| 801 | 385 | Salt Lake City | |
| 820 | 805 | Ventura, Santa Barbara and San Luis Obispo Counties in California | |
| 825 | 403, 780 | Alberta | |
| 829, 849 | 809 | Dominican Republic | |
| 839 | 803 | Central South Carolina | |
| 840 | 909 | Pomona Valley and western San Bernardino County, CA | |
| 848 | 732 | Central New Jersey | |
| 857 | 617 | Boston, Cambridge and Quincy, Massachusetts | |
| 858 | 619 | San Diego, CA and surrounding area | |
| 862 | 973 | Northern New Jersey | |
| 872 | 312, 773 | Chicago, Illinois | |
| 873 | 819 | Gatineau and western Quebec | |
| 878 | 412, 724 | Metro Pittsburgh, Pennsylvania | |
| 917 | 212, 332, 347, 646, 718, 929 | The entirety of New York City (The Bronx, Brooklyn, Manhattan, Queens, and Staten Island) | Originally primarily for cellular phones and pagers |
| 930 | 812 | Southern Indiana | |
| 934 | 631 | Suffolk County, New York | |
| 938 | 256 | Northern Alabama | |
| 939 | 787 | Puerto Rico | |
| 469, 972, 945 | 214 | Eastern greater Dallas-Fort Worth, TX | |
| 947 | 248 | Oakland County, Michigan | |
| 959 | 860 | Northern and western Connecticut | |
| 971 | 503 | Northwestern Oregon, including the Portland, Salem, and Astoria metropolitan areas | |
| 980 | 704 | Charlotte metropolitan area, North Carolina | |
| 984 | 919 | Raleigh-Durham, North Carolina metropolitan area | |
| 986 | 208 | Idaho | |