About this number
(509) 478 is a landline based telephone number operated by Frontier Communications Northw and is located in zip code 99176 in the city of Thornton, Washington, which is in Whitman County, and is in the West. It has a Number Planning Area (NPA - also known as an Area Code) of 509 and Network Numbering Exchange (NXX - also known as a prefix) of 478. It has an Operating Company Number (OCN) of 4324. A Common Language Location Identifier (CLLI) of THTNWAXARS1. As well as a Local access and transport area (LATA) of 676. Zip code 99176 has a population of 145 as of the 2010 census.