About this number
(410) 399 is a landline based telephone number operated by Verizon Maryland, Inc. and is located in zip code 21034 in the city of Darlington, Maryland, which is in Harford County, and is in the South. It has a Number Planning Area (NPA - also known as an Area Code) of 410 and Network Numbering Exchange (NXX - also known as a prefix) of 399. It has an Operating Company Number (OCN) of 9212. A Common Language Location Identifier (CLLI) of DRTNMDDRRS0. As well as a Local access and transport area (LATA) of 238. Zip code 21034 has a population of 3,387 as of the 2010 census.