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.

OCN: 7421 AT&T - LOCAL

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
847-579 2 Deerfield IL   358   2003-07-19   
847-637 4 Arlington Heights IL   358      
847-637 9 Arlington Heights IL   358      
847-643 5 Libertyville IL   358   2001-09-17   
847-794 2 Palatine IL   358      
847-852 5 Barrington IL   358   2003-02-16   
850-360 A Graceville FL PNCYFLMAX3Y  45009      
850-360 9 Graceville FL   45009   2004-08-22   
850-564 A Milton FL PNSCFLBLX9X  44813      
850-564 9 Milton FL   44813      
856-379 A Camden NJ CMDNNJCE69Z  222      
856-379 2 Camden NJ   222      
856-402 A Beaver Brook NJ CMDNNJCE03Z  222      
856-402 9 Beaver Brook NJ   222   2012-09-26   
856-437 A Moorestown NJ CMDNNJCE69Z  222      
856-437 1 Moorestown NJ   222      
856-437 2 Moorestown NJ   222      
856-438 A Merchantville NJ CMDNNJCE69Z  222      
856-438 2 Merchantville NJ   222      
856-480 A Mullica Hill NJ CMDNNJCE69Z  222      
856-480 9 Mullica Hill NJ   222   2021-07-06   
856-568 A Laurel Springs NJ CMDNNJCE69Z  222      
856-568 3 Laurel Springs NJ   222      
856-574 A Marlton NJ CMDNNJCE69Z  222      
856-574 9 Marlton NJ   222      
857-574 7 East Boston MA   128   2001-06-28   
858-304 A Rancho Bernardo CA SNDGCA07DS1  732      
858-304 9 Rancho Bernardo CA   732      
858-369 A Del Mar CA SNDGCA07DS1  732      
858-369 2 Del Mar CA   732      
858-369 4 Del Mar CA   732      
858-431 A La Jolla CA SNDGCA07DS1  732      
858-431 0 La Jolla CA   732      
858-431 1 La Jolla CA   732      
858-431 2 La Jolla CA   732      
858-431 3 La Jolla CA   732      
858-431 5 La Jolla CA   732      
858-431 7 La Jolla CA   732      
858-431 8 La Jolla CA   732      
858-633 A San Diego: Linda Vista DA CA SNDGCA07DS1  732      
858-633 9 San Diego: Linda Vista DA CA   732      
858-740 A San Diego: Mira Mesa DA CA SNDGCA07DS1  732      
858-740 2 San Diego: Mira Mesa DA CA   732      
859-377 A Paris KY LXTNKYXAX3Y  466      
859-377 9 Paris KY   466      
859-378 A Little Rock KY WNCHKYATXPX  466      
859-378 9 Little Rock KY   466   2023-12-08   
860-385 A Southington CT NWHNCT02X5X  920      
860-385 9 Southington CT   920      
860-431 A Simsbury CT NWHNCT02X5X  920      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 >>

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.