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: 580 [Rate centres in NPA 580] [Dial plan for NPA 580]

NXX: 266

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
580-266 A Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 0 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 1 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 2 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 3 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 5 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 6 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 7 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 8 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 9 Martha OK MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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