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: VINNVACB2MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-365 A Damascus MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
240-474 A Gaithersburg MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
240-474 4 Gaithersburg MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236   2015-07-13   
240-633 A Hughesville MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
240-633 3 Hughesville MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236   2015-07-13   
240-661 A Lexington Park-Great Mills MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
240-661 9 Lexington Park-Great Mills MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236   2015-07-12   
301-551 A Washington Zone 3 MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
301-561 A Washington Zone 3 MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
301-584 A Washington Zone 12 MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
301-727 A Washington Zone 5 MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
301-813 A Washington Zone 2 MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
410-509 A Waterloo (Washington DC LATA) MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
410-985 A Waterloo (Washington DC LATA) MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      

Last updated: Fri, 13 May 2022 22:16:13 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.