The Deardurff house, at 72 S. Gift St. In Columbus Ohio, is the oldest known structure in Franklin County still on its original foundation. It was built in 1807, just four years after Ohio achieved statehood.
The Deardurff house was built by David Deardurff for his mother. You can read more about that in this Deardurff family story.
The images here are from various resources. Most of them received from my cousin Willis Deardurff III.