This is a list of the Indiana state historical markers in Adams County.
This is intended to be a complete list of the official state historical markers placed in Adams County, Indiana, United States by the Indiana Historical Bureau. The locations of the historical markers and their latitude and longitude coordinates are included below when available, along with their names, years of placement, and topics as recorded by the Historical Bureau. There are 2 historical markers located in Adams County.
|Marker title||Image||Year placed||Location||Topics|
|The Wayne Trace||1977||6640 N. State Road 101, 0.1 miles north of the U.S. Route 224 junction and 3 miles east of Decatur, on the western side of the road
||Military, American Indian/Native American|
|Geneva Downtown Historic District||2006||Line and High Streets in Geneva
||Business, Industry, and Labor, Historic District, Neighborhoods, and Towns, Buildings and Architecture|