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: CMTNCA01DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
310-537 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-605 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-631 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-632 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-635 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-638 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-639 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-761 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 A Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 0 Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 1 Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 2 Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 3 Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 4 Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 5 Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 6 Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 7 Compton: Compton DA CA 9740 PACIFIC BELL 730      
310-900 8 Compton: Compton DA CA 9740 PACIFIC BELL 730      
323-636 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-636 0 Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.