About this number
(740) 399 is a landline based telephone number operated by United Tel. Co. Of Ohio - Cent and is located in zip code 43050 in the city of Mount Vernon, Ohio, which is in Knox County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 740 and Network Numbering Exchange (NXX - also known as a prefix) of 399. It has an Operating Company Number (OCN) of 661. A Common Language Location Identifier (CLLI) of MTVROHXA39E. As well as a Local access and transport area (LATA) of 923. Zip code 43050 has a population of 29,050 as of the 2010 census.