About this number
(423) 557 is a wireless/mobile based telephone number operated by Suncom DBA T-Mobile USA and is located in zip code 37601 in the city of Johnson City, Tennessee, which is in Washington County, and is in the South. It has a Number Planning Area (NPA - also known as an Area Code) of 423 and Network Numbering Exchange (NXX - also known as a prefix) of 557. It has an Operating Company Number (OCN) of 8645. A Common Language Location Identifier (CLLI) of JHCYTNDD2MD. As well as a Local access and transport area (LATA) of 956. It was first assigned for usage on 09/29/2004. Zip code 37601 has a population of 36,182 as of the 2010 census.