About this number
(301) 256-0016 is a landline based telephone number operated by Level 3 Communications, LLC - and is located in zip code 20852 in the city of Rockville, Maryland, which is in Montgomery County, and is in the South. It has a Number Planning Area (NPA - also known as an Area Code) of 301, a Network Numbering Exchange (NXX - also known as a prefix) of 256 and a subscriber number of 0016. It has an Operating Company Number (OCN) of 6119. A Common Language Location Identifier (CLLI) of NOCLLIKNOWN. As well as a Local access and transport area (LATA) of 236. It was first assigned for usage on 11/06/2007. Zip code 20852 has a population of 40,365 as of the 2010 census.