About this number
(408) 310 is a wireless/mobile based telephone number operated by T-Mobile Usa, Inc. and is located in zip code 94520 in the city of Concord, California, which is in Contra Costa County, and is in the West. It has a Number Planning Area (NPA - also known as an Area Code) of 408 and Network Numbering Exchange (NXX - also known as a prefix) of 310. It has an Operating Company Number (OCN) of 6529. A Common Language Location Identifier (CLLI) of CNCRCALZ0MD. As well as a Local access and transport area (LATA) of 722. It was first assigned for usage on 12/26/2001. Zip code 94520 has a population of 37,208 as of the 2010 census.