← Area code 660
660-388 phone numbers
Numbers 660-388-0000 to 660-388-9999 are assigned to Chariton Valley Tel. Co. in Salisbury, MO. 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 660-388-0xxx, 660-388-1xxx, 660-388-2xxx, 660-388-3xxx, 660-388-7xxx, 660-388-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.