 PSH 1 MA became SR 528 in 1964 during the 1964 highway renumbering, which replaced the earlier system with new state routes.The highway remained split into two sections by Allen Creek, with 4th Street in downtown Marysville and 64th Street (Hickok Road) in eastern Marysville.A connection for SR 528 across Allen Creek was planned in the late 1960s by the state government and approved for construction in 1969, but not built until 1984.