State highway in northeastern Ohio, US
State Route 644 (SR 644) is a north–south state highway running through Columbiana and Carroll counties in northeast Ohio. Its southern terminus is at SR 39 in downtown Salineville, and its northern terminus is at its junction with U.S. Route 30(US 30) and SR 9 in the center of Kensington. The route connects mainly rural and a few unincorporated parts of southeastern Columbiana County. SR 644 only briefly passes into a corner of Carroll County for a 0.41-mile (0.66 km) journey.