About this number
(312) 864 is a landline based telephone number operated by Ameritech Illinois and is located in zip code 60611 in the city of Chicago, Illinois, which is in Cook County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 312 and Network Numbering Exchange (NXX - also known as a prefix) of 864. It has an Operating Company Number (OCN) of 9329. A Common Language Location Identifier (CLLI) of CHCGILMODS1. As well as a Local access and transport area (LATA) of 358. Zip code 60611 has a population of 28,718 as of the 2010 census.