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.

NPA: 805 [Rate centres in NPA 805] [Dial plan for NPA 805]

NXX: 431

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
805-431 A San Luis Obispo CA SNLOCA01XYX  6529 T-MOBILE USA, INC. 740      
805-431 0 San Luis Obispo CA   6529 T-MOBILE USA, INC. 740      
805-431 1 San Luis Obispo CA   6529 T-MOBILE USA, INC. 740      
805-431 2 San Luis Obispo CA   6529 T-MOBILE USA, INC. 740      
805-431 3 San Luis Obispo CA   6529 T-MOBILE USA, INC. 740      
805-431 4 San Luis Obispo CA   6529 T-MOBILE USA, INC. 740      
805-431 5 San Luis Obispo CA   6529 T-MOBILE USA, INC. 740      
805-431 6 San Luis Obispo CA   5562 METROPCS, INC. 740   2021-12-03   
805-431 7 San Luis Obispo CA   6529 T-MOBILE USA, INC. 740      
805-431 8 San Luis Obispo CA   5562 METROPCS, INC. 740      
805-431 9 San Luis Obispo CA   6529 T-MOBILE USA, INC. 740      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.