Highway 91 (AR 91, Ark. 91, and Hwy. 91) is a north–south state highway in the Upper Arkansas Delta. The route of 31.91 miles (51.35 km) begins at US Highway 49 (US 49) and Highway 1 at Jonesboro and runs north to US 412 in Walnut Ridge. The route is maintained by the Arkansas State Highway and Transportation Department (AHTD).