603-607 phone numbers

Numbers 603-607-0000 to 603-607-9999 are assigned to Nuso, LLC (rate centre WCHESTEFLD, NH, NANPA abbreviation). 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 603-607-0xxx, 603-607-3xxx, 603-607-4xxx, 603-607-8xxx, 603-607-9xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 603-607