Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 650 [Rate centres in NPA 650] [Dial plan for NPA 650]

NXX: 221

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
650-221 A South San Francisco CA MLPTCAVPAMD  0051 SHELCOMM 722   2024-11-03   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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