608-309 phone numbers

Numbers 608-309-0000 to 608-309-9999 are assigned to Brightspeed of Central Wisconsin, LLC in Blair, WI. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 608-309-1xxx, 608-309-2xxx, 608-309-3xxx, 608-309-4xxx, 608-309-5xxx, 608-309-6xxx, 608-309-8xxx, 608-309-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 608-309