![]() The rest of the state received the new area code 541. On November 5, 1995, the numbering plan area was restricted to the more densely populated northwestern corner of the state, including Portland. 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. Despite Oregon's growth in the second half of the twentieth century, particularly in the Willamette Valley (Portland and Eugene), this remained so for 48 years, making Oregon one of the largest states by area with a single area code. In the initial configuration of the nationwide telephone numbering plan designed by AT&T in 1947, the state of Oregon was assigned a single area code, 503. ![]() Area code 971 was assigned to the service area in stages, completed in 2008, to form an overlay in the area with ten-digit dialing. Area code 503 was one of the original North American area codes of 1947, assigned to the entire state until 1995, when its extent was reduced to the northwest corner. The numbering plan area (NPA) comprises the cities of Portland, Salem, and Astoria. Area codes 503 and 971 are telephone area codes in the North American Numbering Plan (NANP) for the northwestern region of the U.S.
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