The “Ohio Soldiers in World War I Military Records” index is vital for researching Ohio family histories during the Great War. Given this period's scarcity of genealogical records, the database's extensive coverage becomes even more significant. It includes page images from all twenty-three volumes of “The Official Roster of Ohio Soldiers, Sailors, and Marines in the World War, 1917-18,” encompassing approximately 250,000 individuals who served in World War I. This resource is valuable for understanding military involvement and links to additional genealogical records, such as birth certificates and 1900 U.S. Census data, aiding in the creation of a comprehensive family history.