Smithville-Sanders is a census-designated place (CDP) encompassing the communities of Smithville and Sanders in Monroe County, Indiana, United States.

Most of the CDP consists of rural and semi-suburban land surrounding the two villages.

According to the U.S. Census Bureau, the CDP has an area of 10.72 square miles (27.8 km2), all of it land.

[1] It is bordered to the south and east by portions of Monroe Lake, a reservoir on Salt Creek.

This Monroe County, Indiana location article is a stub.