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: BRHGMDBHRS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-371 A Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-371 0 Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-371 3 Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-371 4 Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-371 5 Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-371 6 Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-371 7 Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-371 8 Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-371 9 Middletown MD 9212 VERIZON MARYLAND, INC. 240      
301-473 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-473 4 Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-473 5 Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-473 7 Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-473 8 Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-473 9 Frederick MD 9212 VERIZON MARYLAND, INC. 240      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.