About this number
(406) 866 is a landline based telephone number operated by Qwest Corporation and is located in zip code 59485 in the city of Ulm, 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 866. It has an Operating Company Number (OCN) of 9636. A Common Language Location Identifier (CLLI) of ULM MTMARS1. As well as a Local access and transport area (LATA) of 648. Zip code 59485 has a population of 705 as of the 2010 census.