312-628 phone numbers

Numbers 312-628-0000 to 312-628-9999 are assigned to Mcimetro Access Transmission Services LLC (rate centre CHICGOZN01, IL, NANPA abbreviation). 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).

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

Reported numbers in 312-628