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: 866H BARR TEL USA, INC. - CT

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
203-971 4 Greenwich CT   132   2021-09-09   
475-275 5 Byram CT   132   2016-07-18   
475-310 7 Wallingford CT   920   2022-05-18   
475-450 A Bridgeport CT HRFRCT0344Z  920      
475-450 1 Bridgeport CT   920   2022-04-23   
475-480 A New Haven CT HRFRCT0344Z  920      
475-480 1 New Haven CT   920   2022-04-22   
475-550 A Stamford CT HRFRCT0344Z  920      
475-550 1 Stamford CT   920   2022-04-23   
475-750 A Danbury CT HRFRCT0344Z  920      
475-750 1 Danbury CT   920   2022-04-23   
475-850 A Norwalk CT HRFRCT0344Z  920      
475-850 1 Norwalk CT   920   2022-04-23   
475-897 0 Greenwich CT   132   2016-07-18   
860-288 0 Manchester CT   920   2022-03-15   
860-413 4 Simsbury CT   920   2022-03-14   
860-750 1 New Milford CT   920   2022-03-14   
860-925 8 Windsor CT   920   2022-03-14   
959-235 1 Bristol CT   920   2022-03-15   
959-244 1 Farmington CT   920   2022-03-15   
959-255 5 Hartford CT   920   2022-03-14   
959-261 5 Southington CT   920   2022-03-15   
959-465 1 Watertown CT   920   2022-03-14   
959-590 A New Britain CT HRFRCT0344Z  920      
959-590 5 New Britain CT   920   2022-05-05   
959-837 5 Norwich CT   920   2022-03-14   
959-885 A Enfield CT HRFRCT0344Z  920      
959-885 5 Enfield CT   920   2022-05-05   
959-951 3 New London CT   920   2022-04-27   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.