Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 660 [Rate centres in NPA 660] [Dial plan for NPA 660]

NXX: 878

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
660-878 A Andover MO LEONIAXODS0  1888 GRAND RIVER MUTUAL TEL CO 632      

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

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