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.

OCN: 6630 SPOK, INC.

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
310-588 A Santa Monica: Santa Monica DA CA LSANCA05TMD  730      
310-685 A Compton: Gardena DA CA LSANCA05TMD  730      
310-716 A Compton: Gardena DA CA LSANCA05TMD  730      
310-718 A Compton: Gardena DA CA LSANCA05TMD  730      
310-723 A Compton: Gardena DA CA LSANCA05TMD  730      
310-790 A Santa Monica: Santa Monica DA CA LSANCA05TMD  730      
310-805 A Compton: Gardena DA CA LSANCA05TMD  730      
310-875 A Santa Monica: Santa Monica DA CA LSANCA05TMD  730      
310-932 A Lakewood CA LSANCA05TMD  730      
310-960 A Compton: Gardena DA CA LSANCA05TMD  730      
310-992 A Santa Monica: Santa Monica DA CA LSANCA05TMD  730      
312-249 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-250 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-271 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-272 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-289 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-290 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-295 A La Grange IL LBRDILGOAMD  358      
312-299 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-349 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-359 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-365 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-367 A La Grange IL LBRDILGOAMD  358      
312-370 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-378 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-387 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-389 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-398 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-418 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-484 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-490 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-495 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-512 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-562 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-571 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-657 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-677 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-688 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-717 A La Grange IL LBRDILGOAMD  358      
312-851 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-891 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-901 A Chicago Zone 01-Calumet IL LBRDILGOAMD  358      
312-941 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
312-963 A Chicago Zone 01-Wabash IL LBRDILGOAMD  358      
313-219 A Detroit Zone 5 MI SFLDMIMKDS2  340      
313-238 A Detroit Zone 5 MI SFLDMIMKDS2  340      
313-239 A Detroit Zone 5 MI SFLDMIMKDS2  340      
313-250 A Detroit Zone 5 MI SFLDMIMKDS2  340      
313-276 A Detroit Zone 5 MI SFLDMIMKDS2  340      
313-280 A Detroit Zone 1 MI SFLDMIMKDS2  340      

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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