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: 612K CSC VOICE, LLC

<< 1 2 3 4 5 6 7 8 9 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
203-504 2 Stamford CT   920   2007-09-20   
203-504 8 Stamford CT   920   2007-09-20   
203-517 9 Stamford CT   920   2008-03-07   
203-522 4 Bridgeport CT   920   2004-10-28   
203-522 5 Bridgeport CT   920   2004-10-28   
203-529 3 Wilton CT   920   2009-09-19   
203-532 5 Byram CT   132   2003-11-15   
203-540 5 Bridgeport CT   920   2006-04-10   
203-542 5 Greenwich CT   132   2003-03-13   
203-549 8 Bridgeport CT   920   2005-04-21   
203-549 9 Bridgeport CT   920   2005-04-21   
203-553 9 New Haven CT   920   2011-08-26   
203-557 0 Westport CT   920      
203-557 3 Westport CT   920      
203-557 4 Westport CT   920      
203-557 6 Westport CT   920   2015-07-25   
203-557 8 Westport CT   920      
203-569 3 Stamford CT   920      
203-569 7 Stamford CT   920      
203-569 9 Stamford CT   920      
203-572 0 Bridgeport CT   920   2007-12-21   
203-586 3 Woodbury CT   920   2003-12-15   
203-587 A Georgetown CT   920      
203-587 1 Georgetown CT   920      
203-587 9 Georgetown CT   920      
203-594 1 New Canaan CT   920      
203-594 7 New Canaan CT   920      
203-594 9 New Canaan CT   920      
203-595 5 Stamford CT   920   2011-04-22   
203-612 1 Bridgeport CT   920   2005-03-10   
203-612 4 Bridgeport CT   920   2006-01-22   
203-612 6 Bridgeport CT   920   2004-11-06   
203-612 7 Bridgeport CT   920   2004-11-06   
203-612 8 Bridgeport CT   920   2004-11-06   
203-614 8 Stamford CT   920   2011-08-26   
203-642 3 Norwalk CT   920   2006-11-13   
203-642 4 Norwalk CT   920   2003-07-21   
203-658 8 Stamford CT   920   2012-08-18   
203-664 1 Redding CT   920      
203-664 4 Redding CT   920   2013-06-08   
203-674 8 Stamford CT   920   2010-12-02   
203-681 2 Byram CT   132   2010-08-26   
203-690 1 Bridgeport CT   920   2011-12-24   
203-693 2 Milford CT   920   2013-06-08   
203-693 3 Milford CT   920   2011-06-24   
203-713 8 Milford CT   920   2010-06-25   
203-717 A Greenwich CT   132      
203-717 1 Greenwich CT   132   2011-03-28   
203-724 9 Stamford CT   920   2013-03-18   
203-762 6 Wilton CT   920   2013-07-17   
203-769 1 Greenwich CT   132   2010-07-23   
203-769 5 Greenwich CT   132   2007-04-03   
203-810 4 Norwalk CT   920   2007-06-10   
203-813 3 Byram CT   132   2005-04-22   
203-817 0 Stamford CT   920   2011-12-05   
203-857 1 Norwalk CT   920   2014-05-03   
203-870 0 Bridgeport CT   920      
203-870 1 Bridgeport CT   920      
203-870 4 Bridgeport CT   920   2006-04-10   
203-870 6 Bridgeport CT   920      
203-870 8 Bridgeport CT   920      
203-870 9 Bridgeport CT   920      
203-873 0 Bridgeport CT   920   2007-11-08   
203-883 8 Stamford CT   920   2007-07-13   
203-890 9 Stamford CT   920   2014-05-16   
203-900 A Greenwich CT   132      
203-900 1 Greenwich CT   132   2012-04-23   
203-908 3 Bridgeport CT   920   2007-07-13   
203-908 4 Bridgeport CT   920   2007-07-13   
203-914 A Stamford CT   920      
203-914 1 Stamford CT   920   2012-04-23   
203-916 7 Bridgeport CT   920   2011-04-22   
203-920 1 New Canaan CT   920   2011-08-26   
203-923 1 Bridgeport CT   920   2006-02-16   
203-923 2 Bridgeport CT   920   2005-03-10   
203-923 8 Bridgeport CT   920   2005-03-10   
203-939 A Norwalk CT   920      
203-939 1 Norwalk CT   920   2008-08-28   
203-939 9 Norwalk CT   920   2012-09-28   
203-955 1 Fairfield CT   920   2011-04-22   
203-956 0 Norwalk CT   920   2006-06-19   
203-957 A Norwalk CT   920      
203-957 3 Norwalk CT   920   2011-07-22   
203-957 8 Norwalk CT   920   2013-04-05   
203-990 0 Old Greenwich CT   920   2007-11-16   
203-990 3 Old Greenwich CT   920   2013-09-14   
203-992 A Greenwich CT   132      
203-992 1 Greenwich CT   132   2006-07-03   
203-998 7 Stamford CT   920   2013-08-09   
332-298 A New York City Zone 01 NY   132   2025-09-26   
332-298 4 New York City Zone 01 NY   132   2025-09-26   
475-209 9 New Haven CT   920   2014-12-05   
475-282 4 Bridgeport CT   920   2013-04-02   
475-282 9 Bridgeport CT   920   2012-09-28   
475-328 9 Darien CT   920   2014-08-22   
475-330 A Fairfield CT   920      
475-330 1 Fairfield CT   920   2015-08-01   
475-396 A Bridgeport CT   920   2025-10-02   
475-396 4 Bridgeport CT   920   2025-10-02   
475-422 9 Bridgeport CT   920   2013-04-15   

<< 1 2 3 4 5 6 7 8 9 >>

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.