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.

Last updated: Sun, 15 Feb 2015 18:38:04 UTC

NPA: 203 [Rate centres in NPA 203] [Dial plan for NPA 203]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA Eff date Disc date Map
203-815 A New Haven CT WLFRCTAICM3  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920     map
203-815 0 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2006-08-03     
203-815 1 New Haven CT   4800 LEVEL 3 COMMUNICATIONS, LLC - CT [link] 920 2010-04-11     
203-815 2 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2006-07-02     
203-815 3 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2006-02-04     
203-815 4 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2006-02-04     
203-815 5 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2005-09-04     
203-815 6 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2006-04-03     
203-815 7 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2006-04-03     
203-815 8 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2005-12-02     
203-815 9 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT [link] 920 2006-04-03     

Sponsored by: Callcentric - VoIP Internet phone service