About this number
(815) 788 is a landline based telephone number operated by Ameritech Illinois and is located in zip code 60012 in the city of Crystal Lake, Illinois, which is in McHenry County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 815 and Network Numbering Exchange (NXX - also known as a prefix) of 788. It has an Operating Company Number (OCN) of 9329. A Common Language Location Identifier (CLLI) of CRLKILCKDS0. As well as a Local access and transport area (LATA) of 358. It was first assigned for usage on 03/22/2001. Zip code 60012 has a population of 11,120 as of the 2010 census.