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area codes: 200, 300, 400, 500, 600, 700, 800, 900
| Area Code | State | City |
| 500 | Personal Services | |
| 501 | AR | Central Arkansas |
| 502 | KY | W Kentucky: Louisville |
| 503 | OR | Oregon |
| 504 | LA | East Louisiana: New Orleans |
| 505 | NM | New Mexico |
| 506 | NB | New Brunswick Canada |
| 507 | MN | South Minnesota: Rochester |
| 508 | MA | Cent. Massachusetts: Framingham |
| 509 | WA | East Washington |
| 510 | CA | California: Oakland, East Bay |
| 511 | Travel information line. | |
| 512 | TX | S Texas: Austin |
| 513 | OH | SW Ohio |
| 514 | QC | SW Quebec: Montreal |
| 515 | IA | Central Iowa |
| 516 | NY | Nassau county on Long Island and New York: Hempstead |
| 517 | MI | Central Michigan |
| 518 | NY | NE New York: Albany |
| 519 | ON | SW Ontario: Windsor |
| 520 | AZ | Arizona outside the Phoenix area |
| 530 | CA | NE California: Chico, Redding |
| 540 | VA | Fredericksburg and Roanoke and nearby areas |
| 541 | OR | Oregon |
| 546 | MI | E Michigan |
| 551 | NJ | North New Jersey |
| 557 | MO | SE Missouri |
| 559 | CA | California: Fresno |
| 561 | FL | Florida (S. Central) (West Palm Beach, Boca Raton, Vero Beach) |
| 562 | CA | California: Long Beach |
| 563 | IA | East Iowa |
| 564 | WA | West Washington |
| 567 | OH | NW Ohio |
| 570 | PA | E Pennsylvania: Wilkes-Barre, Scranton |
| 571 | VA | North Virginia |
| 573 | MO | SE Missouri: excluding St Louis metro area |
| 574 | IN | North Indiana |
| 580 | OK | Western and Sothern Oklahoma |
| 585 | NY | NW New York: Rochester |
| 586 | MI | Michigan |
| 590 | French West Indies |
