Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 503 [Rate centres in NPA 503] [Dial plan for NPA 503]

NXX: 918

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
503-918 A Gresham OR   750E ONVOY, LLC - OR 672   2026-10-25   
503-918 0 Gresham OR   750E ONVOY, LLC - OR 672   2026-10-25   
503-918 1 Gresham OR   157F PEERLESS NETWORK OF OREGON, LLC - OR 672   2026-10-26   
503-918 8 Gresham OR   076F BANDWIDTH.COM CLEC, LLC - OR 672   2026-11-07   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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