There are no segments of SR 197 that are included as a part of the National Highway System (NHS).

The NHS is a network of highways that are identified as being most important for the economy, mobility and defense of the nation.

The route leaves Celina passing through rural Mercer County.

The eastern terminus of the highway is that an intersection with SR 198.

It was originally routed along much of its present alignment, from its western terminus in downtown Celina to its junction with SR 66 south of Spencerville.