About this number
(301) 421-0018 is a landline based telephone number operated by Verizon Maryland, Inc. and is located in zip code 20904 in the city of Silver Spring, 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 421 and a subscriber number of 0018. It has an Operating Company Number (OCN) of 9212. A Common Language Location Identifier (CLLI) of SLSPMDCVDS0. As well as a Local access and transport area (LATA) of 236. Zip code 20904 has a population of 54,612 as of the 2010 census.