About this number
(630) 257 is a landline based telephone number operated by Ameritech Illinois and is located in zip code 60439 in the city of Lemont, Illinois, which is in Du Page County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 630 and Network Numbering Exchange (NXX - also known as a prefix) of 257. It has an Operating Company Number (OCN) of 9329. A Common Language Location Identifier (CLLI) of LEMTILLEDS0. As well as a Local access and transport area (LATA) of 358. Zip code 60439 has a population of 22,919 as of the 2010 census.