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.

NPA: 636 [Rate centres in NPA 636] [Dial plan for NPA 636]

NXX: 538

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-538 A Wentzville MO WNVLMOXAVMD  6529 T-MOBILE USA, INC. 520      
636-538 0 Wentzville MO   6529 T-MOBILE USA, INC. 520      
636-538 1 Wentzville MO   093F ONVOY, LLC - MO 520   2024-04-05   
636-538 2 Wentzville MO   093F ONVOY, LLC - MO 520   2024-04-05   
636-538 3 Wentzville MO   5814 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 520   2024-12-25   
636-538 5 Wentzville MO   093F ONVOY, LLC - MO 520   2018-12-07   
636-538 6 Wentzville MO   093F ONVOY, LLC - MO 520   2021-05-13   
636-538 7 Wentzville MO   093F ONVOY, LLC - MO 520   2021-05-13   
636-538 8 Wentzville MO   5814 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 520   2024-03-26   
636-538 9 Wentzville MO   6529 T-MOBILE USA, INC. 520      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.