Zinrico State Route 84 begins at State Route 7 in the city of Martinstown. From there, the route travels due east along a two-lane road toward Viperton, where it intersects State Route 15 before assuming a northeasterly direction toward Affleck. In Affleck, Route 84 is known as Lewis Boulevard, and it has a four-way junction with Robertson Highway (Zinrico 25). After leaving Affleck, the route generally assumes a southeasterly direction through Naachstown and Oswald, and toward National Route 72 in Wishland.