| Area Code | State, etc. | Main City | Country | Overlay Complex | Time Zone |
|---|---|---|---|---|---|
| 501 | Arkansas | Little Rock | USA | C | |
| 502 | Kentucky | Louisville | USA | E | |
| 503 | Oregon | Portland | USA | 503/971 | P |
| 504 | Louisiana | New Orleans | USA | C | |
| 505 | New Mexico | Albuquerque | USA | M | |
| 506 | New Brunswick | Saint John | Canada | 506/428 | A |
| 507 | Minnesota | Rochester | USA | C | |
| 508 | Massachusetts | Norfolk | USA | 508/774 | E |
| 509 | Washington | Spokane | USA | P | |
| 510 | California | Oakland | USA | 510/341 | P |
| 512 | Texas | Austin | USA | 512/737 | C |
| 513 | Ohio | Cincinnati | USA | 513/283 | E |
| 514 | Quebec | Montreal | Canada | 514/438/263 | E |
| 515 | Iowa | Des Moines | USA | C | |
| 516 | New York | Hempstead | USA | 516/363 | E |
| 517 | Michigan | Lansing | USA | E | |
| 518 | New York | Albany | USA | 518/838 | E |
| 519 | Ontario | London | Canada | 519/226/548/382 | E |
| 520 | Arizona | Tucson | USA | MST | |
| 530 | California | Chico | USA | 530/837 | P |
| 531 | Nebraska | Omaha | USA | 402/531 | C,M |
| 534 | Wisconsin | Eau Claire | USA | 715/534 | C |
| 539 | Oklahoma | Tulsa | USA | 918/539 | C |
| 540 | Virginia | Roanoke | USA | 540/826 | E |
| 541 | Oregon | Eugene | USA | 541/458 | M,P |
| 548 | Ontario | London | Canada | 519/226/548/382 | E |
| 551 | New Jersey | Jersey City | USA | 201/551 | E |
| 557 | Missouri | St Louis | USA | 314/557 | C |
| 559 | California | Fresno | USA | P | |
| 561 | Florida | West Palm Beach | USA | 561/728 | E |
| 562 | California | Long Beach | USA | P | |
| 563 | Iowa | Davenport | USA | C | |
| 564 | Washington | Vancouver | USA | 360/564 | P |
| 567 | Ohio | Toledo | USA | 419/567 | E |
| 570 | Pennsylvania | Scranton | USA | 570/272 | E |
| 571 | Virginia | Arlington | USA | 703/571 | E |
| 572 | Oklahoma | Oklahoma City | USA | 405/572 | C |
| 573 | Missouri | Columbia | USA | 573/235 | C |
| 574 | Indiana | South Bend | USA | E,C | |
| 575 | New Mexico | Las Cruces | USA | M | |
| 579 | Quebec | Laval | Canada | 450/579/354 | E |
| 580 | Oklahoma | Lawton | USA | C | |
| 581 | Quebec | Quebec City | Canada | 418/581/367 | E |
| 582 | Pennsylvania | Erie | USA | 814/582 | E |
| 584 | Manitoba | Winnipeg | Canada | 204/431/584 | C |
| 585 | New York | Rochester | USA | E | |
| 586 | Michigan | Warren | USA | E | |
| 587 | Alberta | Calgary | Canada | 403/587/825/368, 780/587/825/368 | M |