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Although this was intended as a long-term solution, the
Portland area remained home to the great majority of Oregon's landlines, as well as most of its cell phones and pagers, the area continued to experience a shortage in telephone numbers. Within three years, further relief planning commenced. On
106:), this remained so for 48 years, making Oregon one of the largest states by area with a single area code. By the early 1990s, the proliferation of cell phones and pagers, particularly in the Portland area, put this status in jeopardy with the threat of exhaustion of the telephone numbering pool.
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of 1947, assigned to the entire state until 1995, when its extent was reduced to the northwestern corner. Area code 971 was assigned to the service area in stages, completed in 2008, to form an
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On
November 5, 1995, the numbering plan area was reduced to the more densely populated northwestern corner of the state, including Portland. The rest of the state received the new
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in 1947, the state of Oregon was assigned a single area code, 503. Despite Oregon's growth in the second half of the twentieth century, particularly in the
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was to become mandatory in that service area on
January 30, 2000, but the date was extended until October 1, 2000.
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The previously exempted
Clatsop and Tillamook counties were added to the overlay on April 27, 2008.
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was created as a concentrated overlay for most of the numbering plan area, with the exceptions of
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346:. North American Numbering Plan Administration. December 21, 2006. Archived from
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316:"Permissive Dialing Extended for the 503/971 Concentrated Overlay (Oregon)"
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341:"Expansion of the Concentrated NPA 971 Overlay with NPA 503 (Oregon)"
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291:"Concentrated Overlay of 503 Numbering Plan Area (NPA) with 971 NPA"
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321:. North American Numbering Plan Administration. December 10, 1999
19:"Area code 503" redirects here. For the country code 503, see
296:. North American Numbering Plan Administration. July 21, 1999
58:. The numbering plan area (NPA) comprises the cities of
233:"Nation-Wide Operator Toll Dialing—the Coming Way"
144:The service area includes the following counties:
262:"Split of 503 (Oregon) Numbering Plan Area (NPA)"
535:Telecommunications-related introductions in 1947
16:Area codes in northwestern Oregon, United States
90:In the initial configuration of the nationwide
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269:North American Numbering Plan Administration
50:(NANP) for the northwestern region of the
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184:(except southernmost parts around
72:original North American area codes
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231:Mabbs, Ralph (Winter 1947–1948).
21:Telephone numbers in El Salvador
545:Area codes in the United States
166:(far northern parts, including
70:. Area code 503 was one of the
376:NANPA area code map of Oregon
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530:1947 establishments in Oregon
48:North American Numbering Plan
34: Area codes 503 and 971
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92:telephone numbering plan
237:Bell Telephone Magazine
40:Area codes 503 and 971
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129:counties. Initially,
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540:Area codes in Oregon
353:on November 26, 2010
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426:area codes 503/971
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207:Washington County
131:ten-digit dialing
100:Willamette Valley
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370:External links
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271:. May 19, 1995
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117:July 1, 1999,
102:(Portland and
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42:are telephone
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506:45.5°N 123°W
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385:area codes:
355:. Retrieved
348:the original
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323:. Retrieved
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298:. Retrieved
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273:. Retrieved
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245:. Retrieved
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140:Service Area
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94:designed by
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197:Polk County
164:Linn County
524:Categories
511:45.5; -123
457:Washington
247:2023-08-10
218:References
52:U.S. state
44:area codes
186:Jefferson
176:Mill City
127:Tillamook
497:123°00′W
243:(4): 181
96:AT&T
60:Portland
494:45°30′N
448:458/541
435:458/541
391:541/458
387:503/971
357:May 25,
325:May 25,
300:May 25,
275:May 25,
123:Clatsop
86:History
76:overlay
68:Astoria
46:in the
383:Oregon
174:, and
104:Eugene
66:, and
56:Oregon
32:
444:South
400:North
351:(PDF)
344:(PDF)
319:(PDF)
294:(PDF)
265:(PDF)
172:Lyons
64:Salem
431:East
417:West
359:2012
327:2012
302:2012
277:2012
168:Scio
125:and
481:564
477:509
473:425
469:360
465:253
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408:564
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54:of
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23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
