Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: FNTNMONCAMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
235-224 A Cape Girardeau MO 0051 SHELCOMM 520   2026-07-04   
557-252 A St Louis MO 0051 SHELCOMM 520   2026-07-04   
636-301 A St Charles MO 0051 SHELCOMM 520   2026-07-04   
636-470 A O'Fallon MO 0051 SHELCOMM 520   2026-07-04   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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