978-303 phone numbers

Numbers 978-303-0000 to 978-303-9999 are assigned to Level 3 Communications, LLC (rate centre WESTFORD, MA, NANPA abbreviation). 7 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 978-303-3xxx, 978-303-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 978-303