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.

Modesto, CA

<< 1 2 3 4 5 6 7 8 9 10 11 12 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
209-526 A MDSTCA02DS0  9740 PACIFIC BELL 738      
209-527 A MDSTCA02DS0  9740 PACIFIC BELL 738      
209-529 A MDSTCA02DS0  9740 PACIFIC BELL 738      
209-530 A MDSTCA02DS0  9740 PACIFIC BELL 738      
209-531 A MDSTCA03DS0  9740 PACIFIC BELL 738      
209-531 0   9740 PACIFIC BELL 738      
209-531 1   9740 PACIFIC BELL 738      
209-531 2   9740 PACIFIC BELL 738      
209-531 3   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-531 4   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-531 5   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-531 6   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-531 7   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-531 8   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-531 9   9740 PACIFIC BELL 738      
209-534 A SKTOCAOY6MD  6529 T-MOBILE USA, INC. 738      
209-534 0   6529 T-MOBILE USA, INC. 738   2004-06-18   
209-534 1   6529 T-MOBILE USA, INC. 738      
209-534 2   5562 METROPCS, INC. 738   2004-11-11   
209-534 3   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2005-09-19   
209-534 4   6529 T-MOBILE USA, INC. 738      
209-534 5   6529 T-MOBILE USA, INC. 738      
209-534 6   6529 T-MOBILE USA, INC. 738      
209-534 7   6529 T-MOBILE USA, INC. 738      
209-534 8   5562 METROPCS, INC. 738      
209-534 9   5562 METROPCS, INC. 738      
209-537 A MDSTCA03DS0  9740 PACIFIC BELL 738      
209-538 A MDSTCA03DS0  9740 PACIFIC BELL 738      
209-541 A MDSTCA03DS0  9740 PACIFIC BELL 738      
209-541 0   9740 PACIFIC BELL 738      
209-541 1   9740 PACIFIC BELL 738      
209-541 2   9740 PACIFIC BELL 738      
209-541 3   9740 PACIFIC BELL 738      
209-541 4   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-541 5   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-541 6   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-541 7   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-541 8   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-541 9   6010 NEW CINGULAR WIRELESS PCS, LLC 738      
209-543 A MDSTCA04RS0  9740 PACIFIC BELL 738      
209-543 0   9740 PACIFIC BELL 738      
209-543 1   9740 PACIFIC BELL 738      
209-543 2   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2005-09-19   
209-543 3   9740 PACIFIC BELL 738      
209-543 4   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2005-09-19   
209-543 5   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2005-09-19   
209-543 6   9740 PACIFIC BELL 738      
209-543 7   9740 PACIFIC BELL 738      
209-543 8   9740 PACIFIC BELL 738      
209-543 9   9740 PACIFIC BELL 738      
209-544 A MDSTCA02DS0  9740 PACIFIC BELL 738      
209-545 A MDSTCA04RS0  9740 PACIFIC BELL 738      
209-548 A MDSTCA02DS0  9740 PACIFIC BELL 738      
209-548 0   9740 PACIFIC BELL 738      
209-548 1   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2020-01-28   
209-548 2   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2019-07-01   
209-548 3   9740 PACIFIC BELL 738      
209-548 4   9740 PACIFIC BELL 738      
209-548 5   9740 PACIFIC BELL 738      
209-548 6   9740 PACIFIC BELL 738      
209-548 7   9740 PACIFIC BELL 738      
209-548 8   9740 PACIFIC BELL 738      
209-548 9   9740 PACIFIC BELL 738      
209-549 A MDSTCA02DS0  9740 PACIFIC BELL 738      
209-549 0   9740 PACIFIC BELL 738      
209-549 1   9740 PACIFIC BELL 738      
209-549 2   9740 PACIFIC BELL 738      
209-549 3   9740 PACIFIC BELL 738      
209-549 4   9740 PACIFIC BELL 738      
209-549 5   9740 PACIFIC BELL 738      
209-549 6   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2005-09-19   
209-549 7   9740 PACIFIC BELL 738      
209-549 8   9740 PACIFIC BELL 738      
209-549 9   9740 PACIFIC BELL 738      
209-550 A MDSTCA02DS0  9740 PACIFIC BELL 738      
209-550 0   9740 PACIFIC BELL 738      
209-550 1   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2006-01-26   
209-550 2   9740 PACIFIC BELL 738      
209-550 3   9740 PACIFIC BELL 738      
209-550 4   9740 PACIFIC BELL 738      
209-550 5   9740 PACIFIC BELL 738      
209-550 6   7145 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 738   2020-04-10   
209-550 7   9740 PACIFIC BELL 738      
209-550 8   9740 PACIFIC BELL 738      
209-550 9   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2020-12-07   
209-551 A MDSTCA05DS0  9740 PACIFIC BELL 738      
209-552 A MDSTCA05DS0  9740 PACIFIC BELL 738      
209-552 0   9740 PACIFIC BELL 738      
209-552 1   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2006-01-26   
209-552 2   9740 PACIFIC BELL 738      
209-552 3   9740 PACIFIC BELL 738      
209-552 4   7145 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 738   2002-07-23   
209-552 5   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2005-08-02   
209-552 6   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2006-01-26   
209-552 7   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 738   2006-05-27   
209-552 8   9740 PACIFIC BELL 738      
209-552 9   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2005-08-02   
209-554 A SKTNCA01XFY  649C ONVOY, LLC - CA 738      
209-556 A MDSTCA03DS0  9740 PACIFIC BELL 738      
209-556 0   9740 PACIFIC BELL 738      

<< 1 2 3 4 5 6 7 8 9 10 11 12 >>

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.