U.S. Route 371 is a north–south United States highway in the U.S. states of Arkansas and Louisiana. The highway's northern terminus is in De Queen, Arkansas at an intersection with U.S. Highway 70. It is co-signed for its last 13 miles (21 km) between Lockesburg, Arkansas and DeQueen with U.S. Highway 59 and U.S. Highway 71. Its southern terminus is 5 miles (8.0 km) west of Coushatta, Louisiana at an intersection with Interstate 49.

Columbia County is a county located in the U.S. state of Arkansas. As of the 2020 census, the population was 22,801. The county seat is Magnolia. The county was formed on December 17, 1852, and was named for Christopher Columbus. The Magnolia, AR Micropolitan Statistical Area includes all of Columbia County.