Lawrence County is a county located in the U.S. state of Arkansas. As of the 2020 census, the population was 16,216. The county seat is Walnut Ridge. Lawrence County is Arkansas's second county, formed on January 15, 1815, and named for Captain James Lawrence who fought in the War of 1812. It is an alcohol prohibition or dry county.

Walnut Ridge is a city in and the county seat of Lawrence County, Arkansas, United States. The population was 5,098 at the United States Census's 2019 estimate. Walnut Ridge lies immediately north of Hoxie. The two towns form a contiguous urban area with approximately 8,000 residents. Williams Baptist University is in College City, a formerly separate community that merged into Walnut Ridge in 2017.