About this number
(870) 878 is a landline based telephone number operated by Southwestern Bell and is located in zip code 72415 in the city of Black Rock, Arkansas, which is in Lawrence County, and is in the South. It has a Number Planning Area (NPA - also known as an Area Code) of 870 and Network Numbering Exchange (NXX - also known as a prefix) of 878. It has an Operating Company Number (OCN) of 9533. A Common Language Location Identifier (CLLI) of BLRKARMARS2. As well as a Local access and transport area (LATA) of 528. Zip code 72415 has a population of 1,346 as of the 2010 census.