815-528 phone numbers

Numbers 815-528-0000 to 815-528-9999 are assigned to Teleport Communications America, LLC in McHenry, IL. 7 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 815-528-6xxx, 815-528-7xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 815-528