What does 503 mean in US Phone Area Codes?

This page is about the meanings of the acronym/abbreviation/shorthand 503 in the Regional field in general and in the US Phone Area Codes terminology in particular.

Oregon - Northwest and Portland tri-metro

Regional » US Phone Area Codes

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"503." Abbreviations.com. STANDS4 LLC, 2015. Web. 2 Mar. 2015. <http://www.abbreviations.com/term/308953>.

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