In the mid 1920s SR 189 was rerouted onto its current route between Fort Jennings and Vaughnsville.

After curving towards the southeast, the route leaves the village of Ottoville and the road passes through farmland.

The road passes through commercial properties, before the concurrency ends with SR 189 turning towards the southeast.

SR 189 crosses the Auglaize River and leaves the village of Fort Jennings.

[4][5][6] SR 189 heads east towards Vaughnsville, the AADT drops to 330 vehicles through this section of road.

[4][5][6] There are no segments of SR 189 that are included as a part of the National Highway System (NHS).