About this number
(636) 256 is a landline based telephone number operated by Southwestern Bell and is located in zip code 63011 in the city of Ballwin, Missouri, which is in St Louis County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 636 and Network Numbering Exchange (NXX - also known as a prefix) of 256. It has an Operating Company Number (OCN) of 9533. A Common Language Location Identifier (CLLI) of MNCHMO59DS0. As well as a Local access and transport area (LATA) of 520. Zip code 63011 has a population of 36,347 as of the 2010 census.