607-603 phone numbers

Numbers 607-603-0000 to 607-603-9999 are assigned to Northland Networks, Ltd. in Ithaca, NY. 6 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 607-603-2xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 607-603