← Area code 603
603-798 phone numbers
Numbers 603-798-0000 to 603-798-9999 are assigned to Kearsarge Tel. Co. (rate centre CHICHESTER, NH, NANPA abbreviation). 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 603-798-1xxx, 603-798-2xxx, 603-798-6xxx, 603-798-7xxx, 603-798-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.