About this number
(301) 289 is a landline based telephone number operated by McI Worldcom Communications, I 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 and Network Numbering Exchange (NXX - also known as a prefix) of 289. It has an Operating Company Number (OCN) of 7228. A Common Language Location Identifier (CLLI) of RKVLMDMRDMD. As well as a Local access and transport area (LATA) of 236. Zip code 20852 has a population of 40,365 as of the 2010 census.