About this number
(580) 635 is a landline based telephone number operated by Southwestern Bell and is located in zip code 73743 in the city of Hillsdale, Oklahoma, which is in Garfield County, and is in the South. It has a Number Planning Area (NPA - also known as an Area Code) of 580 and Network Numbering Exchange (NXX - also known as a prefix) of 635. It has an Operating Company Number (OCN) of 9533. A Common Language Location Identifier (CLLI) of HLDLOKMARL0. As well as a Local access and transport area (LATA) of 536. Zip code 73743 has a population of 122 as of the 2010 census.