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: 303

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-303 A Greenwich CT NYCMNY13XJX  478J NUSO, LLC 132      
475-303 0 Greenwich CT   624H ONVOY SPECTRUM, LLC 132   2022-01-07   
475-303 1 Greenwich CT   478J NUSO, LLC 132   2020-11-02   
475-303 2 Greenwich CT   639C ONVOY, LLC - CT 132   2021-08-08   
475-303 3 Greenwich CT   199F BANDWIDTH.COM CLEC, LLC - CT 132   2023-05-08   
475-303 4 Greenwich CT   639C ONVOY, LLC - CT 132   2021-02-06   
475-303 5 Greenwich CT   639C ONVOY, LLC - CT 132   2021-02-06   
475-303 6 Greenwich CT   639C ONVOY, LLC - CT 132   2021-02-06   
475-303 7 Greenwich CT   639C ONVOY, LLC - CT 132   2021-02-06   
475-303 8 Greenwich CT   624H ONVOY SPECTRUM, LLC 132   2021-04-16   
475-303 9 Greenwich CT   624H ONVOY SPECTRUM, LLC 132   2022-02-13   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.