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・ Area codes 305 and 786
・ Area codes 306 and 639
・ Area codes 310 and 424
・ Area codes 317 and 463
・ Area codes 336 and 743
・ Area codes 402 and 531
・ Area codes 408 and 669
・ Area codes 410, 443, and 667
・ Area codes 415 and 628
・ Area codes 416, 647, and 437
・ Area codes 418 and 581
・ Area codes 419 and 567
・ Area codes 430 and 903
・ Area codes 442 and 760
・ Area codes 450 and 579
Area codes 503 and 971
・ Area codes 508 and 774
・ Area codes 512 and 737
・ Area codes 514 and 438
・ Area codes 519, 226 and 548
・ Area codes 541 and 458
・ Area codes 570 and 272
・ Area codes 571 and 703
・ Area codes 601 and 769
・ Area codes 610 and 484
・ Area codes 613 and 343
・ Area codes 614 and 380
・ Area codes 615 and 629
・ Area codes 617 and 857
・ Area codes 630 and 331


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Area codes 503 and 971 : ウィキペディア英語版
Area codes 503 and 971

North American telephone area codes 503 and 971 serve the northwestern region of Oregon, including the Portland, Salem, and Astoria metropolitan areas.
==History==
Area code 503 was one of the original area codes created as part of the North American Numbering Plan by AT&T and Bell Laboratories in 1947.〔(【引用サイトリンク】title=Area Code History )
Area code 503 was used for the entire state of Oregon until November 5, 1995, when area code 541 began service. With that change, the northwest, and most heavily populated, corner of the state retained the 503 area code and the rest of the state moved to 541.
On July 1, 1999, area code 971 was added to share the service area, with the exceptions of Clatsop and Tillamook counties. Initially, 10-digit dialing was to become mandatory in that service area on January 30, 2000, but the date was extended until October 1, 2000.
The previously exempted Clatsop and Tillamook counties were added to the 503/971 overlay on April 27, 2008.

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