About this number
(309) 378 is a landline based telephone number operated by Frontier North, Inc. - Il and is located in zip code 61736 in the city of Downs, Illinois, which is in McLean County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 309 and Network Numbering Exchange (NXX - also known as a prefix) of 378. It has an Operating Company Number (OCN) of 1015. A Common Language Location Identifier (CLLI) of DWNSILXDRS0. As well as a Local access and transport area (LATA) of 366. Zip code 61736 has a population of 1,808 as of the 2010 census.