About this number
(406) 221 is a landline based telephone number operated by At&T Local and is located in zip code 59601 in the city of Helena, Montana, which is in Lewis And Clark 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 221. It has an Operating Company Number (OCN) of 7421. A Common Language Location Identifier (CLLI) of HLNAMTMAKMD. As well as a Local access and transport area (LATA) of 648. It was first assigned for usage on 02/13/2003. Zip code 59601 has a population of 29,283 as of the 2010 census.