About This Place
Black Rock is a city in Lawrence County, Arkansas, United States, along the Black River. The population was 717 at the 2000 census.
Black Rock is located at 36°6′28″N 91°5′56″W / 36.10778°N 91.09889°W / 36.10778; -91.09889 (36.107794, -91.098913).
According to the United States Census Bureau, the city has a total area of 3.4 square miles (8.9 km²), of which, 3.3 square miles (8.5 km²) of it is land and 0.2 square miles (0.4 km²) of it (4.37%) is water.