Area Code 503 was established in 1947 under the NANP (North American Numbering Plan). The Code 503 served the entire State of Oregon until it was overlaid by area code 541 on 5th November 1995.
New area code 971 was introduced for providing numbering relief to areas under 503. After that it became mandatory to dial a ten-digit number for making even local calls else the calls may connect to wrong destination.
Time Zone followed by the 503 area code is Pacific Time Zone. The State of Oregon has kept three area codes reserved for providing telephone services to customers:
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