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: 918 [Rate centres in NPA 918] [Dial plan for NPA 918]

NXX: 437

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
918-437 A Tulsa OK TULSOKGERSC  9533 SOUTHWESTERN BELL 538      
918-437 0 Tulsa OK   9533 SOUTHWESTERN BELL 538      
918-437 1 Tulsa OK   9533 SOUTHWESTERN BELL 538      
918-437 2 Tulsa OK   9533 SOUTHWESTERN BELL 538      
918-437 3 Tulsa OK   9533 SOUTHWESTERN BELL 538      
918-437 4 Tulsa OK   9533 SOUTHWESTERN BELL 538      
918-437 5 Tulsa OK   9533 SOUTHWESTERN BELL 538      
918-437 7 Tulsa OK   9533 SOUTHWESTERN BELL 538      
918-437 8 Tulsa OK   9533 SOUTHWESTERN BELL 538      
918-437 9 Tulsa OK   9533 SOUTHWESTERN BELL 538      

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.