Armco Park Mound I is an archaeological site near Otterbein, Ohio. It was listed in the National Register of Historic Places on May 29, 1975. Publication of the location of this site by the United States government is restricted under the Archaeological Resources Protection Act of 1979. See also List of Registered Historic Places in Warren County, Ohio List of burial mounds in the United States Protected area References National Register of Historic Places in Warren County, Ohio Archaeological sites on the National Register of Historic Places in Ohio Geography of Warren County, Ohio Mounds in Ohio