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.

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
203-485 0 Greenwich CT   132      
203-489 3 Greenwich CT   132   2011-07-22   
203-502 1 Bridgeport CT   920   2005-04-21   
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      

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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