810-420 phone numbers

Numbers 810-420-0000 to 810-420-9999 are assigned to Level 3 Communications, LLC in Marine City, MI. 7 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 810-420-6xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 810-420