Located on both sides of the Indiana/Ohio border,[2] the historic district is composed of five contributing properties spread out across 8 acres (3.2 ha) of land.

[1] It is believed to have been the site of a village of the Fort Ancient culture of prehistoric Native Americans.

[2]: 113–114  Occupation of these sites is believed to date from the Middle Fort Ancient period of the thirteenth century AD.

[5] Because the midden is wide but quite shallow, it has been proposed that the village's population was significant but its period of occupation was short.

[3] In 1975, State Line was listed on the National Register of Historic Places for its archaeological significance.