About this number
(636) 561 is a landline based telephone number operated by Centurytel Missouri LLC (South and is located in zip code 63366 in the city of O Fallon, Missouri, which is in St Charles 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 561. It has an Operating Company Number (OCN) of 9787. A Common Language Location Identifier (CLLI) of DRDNMOXARS1. As well as a Local access and transport area (LATA) of 520. Zip code 63366 has a population of 46,175 as of the 2010 census.