About this number
(406) 403 is a landline based telephone number operated by Onvoy, Inc. - Mt and is located in zip code 59401 in the city of Great Falls, Montana, which is in Cascade County, and is in the West. It has a Number Planning Area (NPA - also known as an Area Code) of 406 and Network Numbering Exchange (NXX - also known as a prefix) of 403. It has an Operating Company Number (OCN) of 715G. A Common Language Location Identifier (CLLI) of GRFLMT29WAC. As well as a Local access and transport area (LATA) of 648. It was first assigned for usage on 03/08/2006. Zip code 59401 has a population of 13,774 as of the 2010 census.