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.

Chicago Zone 01-Calumet, IL

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
312-884 A CHCGILWBXWZ  829J PAETEC ITEL, LLC 358   2024-12-09   
312-884 0   829J PAETEC ITEL, LLC 358      
312-884 1   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-884 2   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2000-08-17   
312-884 3   460K FIRST COMMUNICATIONS, LLC 358   2000-03-23   
312-884 4   460K FIRST COMMUNICATIONS, LLC 358   2000-03-23   
312-884 5   829J PAETEC ITEL, LLC 358      
312-884 6   9329 ILLINOIS BELL TEL CO 358   2000-11-17   
312-884 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2000-06-05   
312-884 8   829J PAETEC ITEL, LLC 358   2001-01-18   
312-884 9   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-885 A ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-885 0   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 1   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 2   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 3   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 4   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 5   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 6   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 7   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 8   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-885 9   6529 T-MOBILE USA, INC. 358   2015-11-16   
312-888 A BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-888 0   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2012-03-31   
312-888 1   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2012-03-31   
312-888 2   318J COMCAST IP PHONE, LLC 358   2012-03-19   
312-888 3   318J COMCAST IP PHONE, LLC 358   2012-03-19   
312-888 4   5447 ACCESS ONE, INC. - IL 358   2013-12-19   
312-888 5   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2012-03-31   
312-888 6   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2012-03-31   
312-888 7   224C ONVOY, LLC 358   2013-12-19   
312-888 8   224C ONVOY, LLC 358   2013-12-19   
312-888 9   318J COMCAST IP PHONE, LLC 358   2012-08-31   
312-889 A CHCGILCGDS1  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-889 0   6529 T-MOBILE USA, INC. 358   2015-08-25   
312-889 1   6529 T-MOBILE USA, INC. 358   2015-08-25   
312-889 2   6529 T-MOBILE USA, INC. 358   2015-08-25   
312-889 3   6529 T-MOBILE USA, INC. 358   2015-08-25   
312-889 4   6529 T-MOBILE USA, INC. 358   2015-08-25   
312-889 5   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2015-08-24   
312-889 6   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2015-08-24   
312-889 7   6529 T-MOBILE USA, INC. 358   2015-08-25   
312-889 8   6529 T-MOBILE USA, INC. 358   2015-08-25   
312-889 9   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2015-08-25   
312-890 A ELGNILOTGT5  5562 METROPCS, INC. 358      
312-890 0   6529 T-MOBILE USA, INC. 358   2010-11-05   
312-890 1   5562 METROPCS, INC. 358   2010-11-05   
312-890 2   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-890 3   5562 METROPCS, INC. 358      
312-890 4   5562 METROPCS, INC. 358   2010-11-05   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 >>

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.