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: 410 [Rate centres in NPA 410] [Dial plan for NPA 410]

NXX: 237

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
410-237 A Baltimore MD BLTMMDCH1DD  9212 VERIZON MARYLAND, INC. 238      
410-237 0 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-07-23   
410-237 1 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-02-14   
410-237 2 Baltimore MD BLTMMDCH1DD  9212 VERIZON MARYLAND, INC. 238      
410-237 3 Baltimore MD BLTMMDCH1DD  9212 VERIZON MARYLAND, INC. 238      
410-237 4 Baltimore MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
410-237 5 Baltimore MD BLTMMDCH1DD  9212 VERIZON MARYLAND, INC. 238      
410-237 6 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-06-02   
410-237 7 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-12-01   
410-237 8 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-12-01   
410-237 9 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-02-14   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.