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: 475 [Rate centres in NPA 475] [Dial plan for NPA 475]

NXX: 402

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-402 A New Haven CT   639C ONVOY, LLC - CT 920   2026-09-27   
475-402 0 New Haven CT   639C ONVOY, LLC - CT 920   2026-09-27   
475-402 1 New Haven CT   639C ONVOY, LLC - CT 920   2026-09-27   
475-402 2 New Haven CT   639C ONVOY, LLC - CT 920   2026-09-28   
475-402 6 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2026-10-15   
475-402 7 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2026-10-15   
475-402 8 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2026-10-15   
475-402 9 New Haven CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2026-10-15   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.