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: 660 [Rate centres in NPA 660] [Dial plan for NPA 660]

NXX: 535

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
660-535 A King City MO KGCYMOXARS0  1811 EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 524      
660-535 0 King City MO KGCYMOXARS0  1811 EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 524      
660-535 4 King City MO KGCYMOXARS0  1811 EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 524      
660-535 5 King City MO KGCYMOXARS0  1811 EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 524      
660-535 6 King City MO KGCYMOXARS0  1811 EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 524      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.