309-304 phone numbers

Numbers 309-304-0000 to 309-304-9999 are assigned to Frontier North, Inc. in Eureka, IL. 9 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 309-304-6xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 309-304