About this number
(815) 564 is a landline based telephone number operated by Ameritech Illinois and is located in zip code 61081 in the city of Sterling, Illinois, which is in Whiteside 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 564. It has an Operating Company Number (OCN) of 9329. A Common Language Location Identifier (CLLI) of STNGILSIDS0. As well as a Local access and transport area (LATA) of 364. Zip code 61081 has a population of 21,934 as of the 2010 census.