List of area code overlays

|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

|904

|Jacksonville, Jacksonville Beach, Fernandina Beach, Orange Park and surrounding communities

|

| 740

| Central and southeastern Ohio

|

| 717

| South Central Pennsylvania

|

| 847

| Northern suburbs of Chicago, Illinois

|

| 519

| Southwestern Ontario

|

| 330

| Akron-Canton and Warren-Youngstown areas in Ohio

|

| 604, 250

| British Columbia

|

| 301

| Washington, D.C. suburbs and panhandle of Maryland

|

| 705

| Northeastern and central Ontario

|

| 215

| Philadelphia, Pennsylvania area and a small portion of its Pennsylvania suburbs

|

| 570

| Northeastern Pennsylvania, including the cities of Scranton, Wilkes-Barre, and Williamsport

|

| 916

| Sacramento, California and surrounding suburbs

|

| 713

| Greater Houston, Texas

|

| 905

| Golden Horseshoe region of Ontario, including suburban Toronto, Hamilton, Oshawa, and the Niagara Peninsula in Ontario

|

| 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

| 213

| Central Los Angeles, incl. Downtown L.A. and Hollywood

|

| 937

| Southwest Ohio

|

| 630

| Western suburbs of Chicago

|

| 212

| New York City borough of Manhattan, except for the Marble Hill neighborhood, which is physically connected to The Bronx and uses 718

|

| 781

| Suburban Boston, Massachusetts and most of the South Shore region

|

| 510

| San Francisco East Bay

|

| 613

| Ottawa and eastern Ontario

|

| 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 BronxMadison, Linc. [http://www.lincmad.com/locator.html "LincMad's Area Code Locator Table"]. LincMad. September 29, 2005. Accessed October 28, 2005.

|

| 978

| North-central and most of northeastern Massachusetts

|

| 270

| Western half of Kentucky, including the Purchase area, the Western Coal Fields, and most of the Pennyrile{{cite web|url=http://migration.kentucky.gov/Newsroom/psc/PSCPR12-17-2012.htm|title=PSC Selects Overlay for New Area Code in Western Kentucky: Current numbers in area code 270 remain unchanged; decision means 10-digit dialing for local calls beginning in 2014 |accessdate=December 17, 2012}}

|

| 418

| Eastern Quebec

|

| 780, 403

| Alberta

|

| 614

| Columbus, Ohio, and suburbs

|

| 801

| Along the Wasatch Front of Utah, including Salt Lake City, Provo–Orem, and Ogden

|

| 310

| Southwestern Los Angeles County, California

|

| 903

| Northeastern Texas

|

| 204

| Manitoba

|

| 416

| Toronto, Ontario

|

| 514

| Island of Montreal, Quebec

|

| 760

| Southeastern California

|

| 410

| Baltimore metropolitan area and the Eastern Shore of Maryland

|

| 217

| Central Illinois

|

| 850

| Florida Panhandle, including Tallahassee and Pensacola

|

| 541

| Most of Oregon, excluding its northwestern part

|

| 708

| Near western suburbs and southern suburbs of Chicago

|

| 214

| Eastern portion of the Dallas–Fort Worth metroplex in and around Dallas, Texas

|

| 404, 770

| Atlanta metropolitan area, Georgia

|

| 306

| Saskatchewan

|

| 203

| Southwestern Connecticut

|

| 610

| Eastern and parts of southeastern Pennsylvania

|

| 402

| Eastern Nebraska

|

| 715

| Northern Wisconsin

|

| 918

| Northeastern Oklahoma

|

| 201

| Northeastern New Jersey

|

| 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{{cite web |title=PL-492: NPA 564 to Overlay NPA 360 (Washington) |url=https://www.nationalnanpa.com/pdf/PL-492.pdf |website=North American Numbering Plan Administrator |accessdate=2020-08-25 |date=2016-06-28}}

| 419

| Northwestern Ohio, including Toledo and Lima

|

| 703

| Northern Virginia

|

| 405

| Central Oklahoma, including greater Oklahoma City

|

| 814

| Central and western Pennsylvania, including Altoona, DuBois, and Erie

|

| 403, 780

| Alberta

|

| 415

| San Francisco, Marin County and small portions of San Mateo County

|

| 615

| Nashville, Tennessee

|

| 306

| Saskatchewan

|

| 609

| Central and southeast New Jersey

|

| 714

| Northern Orange County, California

|

| 876

| Jamaica

|

| 205

| Western and central Alabama

|

| 408

| Southern Bay Area in California, encompassing much of Santa Clara County and Silicon Valley{{cite web|url=http://sanfrancisco.cbslocal.com/2012/10/19/new-669-area-code-joins-south-bay-408-region-saturday/|title=New 669 Area Code Joins South Bay 408 Region Saturday|date=19 October 2012|publisher=KPIX-TV}}

|

| 604, 250

| British Columbia

|

| 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

|

| 304

| West Virginia

|

| 817

| Western part of the Dallas–Fort Worth metroplex, in and around Fort Worth, Texas

|

| 407

| Orlando, Florida

|

| 303

| Denver metropolitan area, Colorado

|

| 702

| Clark County, Nevada

|

| 210

| San Antonio, Texas

|

| 512

| Austin, Texas

|

| 336

| Piedmont Triad, North Carolina including Greensboro, Winston-Salem, and western areas of the Raleigh-Durham metropolitan area.

|

| 818

| San Fernando Valley, California

|

| 954

| Broward County, Florida

|

| 601

| Central Mississippi

|

| 202

| Washington, D.C.

|

| 508

| South-central and most of southeastern Massachusetts, including Cape Cod and the Islands

|

| 604, 250

| British Columbia

|

| 815

| Northern and north-central Illinois, including the Rockford, Freeport, and Kankakee areas

|

| 902

| Nova Scotia and Prince Edward Island on 30 November 2014

|

| 305

| Miami-Dade County, Florida and the Florida Keys

|

|385

|Salt Lake City

|

| 805

| Ventura, Santa Barbara and San Luis Obispo Counties in California

|

| 403, 780

| Alberta

|

| 809

| Dominican Republic

|

| 803

| Central South Carolina

|

| 909

| Pomona Valley and western San Bernardino County, CA

|

| 732

| Central New Jersey

|

| 617

| Boston, Cambridge and Quincy, Massachusetts

|

| 619

| San Diego, CA and surrounding area

|

| 973

| Northern New Jersey

|

| 312, 773

| Chicago, Illinois

|

| 819

| Gatineau and western Quebec

|

| 412, 724

| Metro Pittsburgh, Pennsylvania

|

| 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

| 812

| Southern Indiana

|

| 631

| Suffolk County, New York

|

| 256

| Northern Alabama

|

| 787

| Puerto Rico

|

| 214

| Eastern greater Dallas-Fort Worth, TX

|

| 248

| Oakland County, Michigan

|

| 860

| Northern and western Connecticut

|

| 503

| Northwestern Oregon, including the Portland, Salem, and Astoria metropolitan areas

|

| 704

| Charlotte metropolitan area, North Carolina

|

| 919

| Raleigh-Durham, North Carolina metropolitan area

|

| 208

| Idaho

|