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.

Switch: COTNCA11DS0

Remotes:

Switch Switch name Switch type
BAKRCA11RS0  BAKER  5ER 
FRCKCA11RS0  FURNACE CREEK  5ER 
MTPSCA11RS1  MOUNTAIN PASS  5ER 
SHSHCA11RS0  SHOSHONE  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
909-370 A Colton CA 9740 PACIFIC BELL 730      
909-420 A Colton CA 9740 PACIFIC BELL 730      
909-422 A Colton CA 9740 PACIFIC BELL 730      
909-423 A Colton CA 9740 PACIFIC BELL 730      
909-424 A Colton CA 9740 PACIFIC BELL 730      
909-426 A Colton CA 9740 PACIFIC BELL 730      
909-430 A Colton CA 9740 PACIFIC BELL 730      
909-433 A Colton CA 9740 PACIFIC BELL 730      
909-439 A Colton CA 9740 PACIFIC BELL 730      
909-512 A Colton CA 9740 PACIFIC BELL 730      
909-514 A Colton CA 9740 PACIFIC BELL 730      
909-554 A Colton CA 9740 PACIFIC BELL 730      
909-570 A Calimesa CA 7480 PACIFIC BELL (COMPETITIVE) 730      
909-580 A Colton CA 9740 PACIFIC BELL 730      
909-777 A Colton CA 9740 PACIFIC BELL 730      
909-783 A Colton CA 9740 PACIFIC BELL 730      
909-801 A Redlands CA 7480 PACIFIC BELL (COMPETITIVE) 730      
909-804 A Marshall CA 7480 PACIFIC BELL (COMPETITIVE) 730      
909-806 A San Bernardino CA 7480 PACIFIC BELL (COMPETITIVE) 730      
909-810 A Mentone CA 7480 PACIFIC BELL (COMPETITIVE) 730      
909-824 A Colton CA 9740 PACIFIC BELL 730      
909-825 A Colton CA 9740 PACIFIC BELL 730      
909-872 A Colton CA 9740 PACIFIC BELL 730      
909-876 A Colton CA 9740 PACIFIC BELL 730      
951-571 A Moreno CA 7480 PACIFIC BELL (COMPETITIVE) 730      
951-572 A Banning CA 7480 PACIFIC BELL (COMPETITIVE) 730      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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