Highway 4 (AR 4, Ark. 4, and Hwy. 4) is a designation for two state highways in Arkansas. The western segment of 2.99 miles (4.81 km) runs from SH-4 at the Oklahoma state line and terminates in Cove. An eastern segment of 22.49 miles (36.19 km) begins at U.S. Route 278 (US 278) in McGehee and heads east to Arkansas City then north to Highway 1 before terminating. The two routes were formerly connected until a portion of approximately 230 miles (370 km) was redesignated US 278 in 1998. The eastern segment is part of the Great River Road.
Highway 4B was a business route of 2.97 miles (4.78 km) in Camden; it was renamed U.S. 278B in the 1998 redesignation. The route began on Washington Street near the Camden Country Club and terminated at U.S. 79B.