Provides a library for family historians - 70,000 volumes. Publisher of two periodicals on Ohio genealogy and numerous reference books; home to four lineage groups: First Families of Ohio, Society of Civil War Families of Ohio, Settlers and Builders of Ohio, and Century Families of Ohio. Volunteers welcome.

Offers a genealogy collection that provides a selection of materials for researchers, with an emphasis on sources for the eastern United States and especially Ohio. Includes a wide variety of genealogical periodicals; a large manuscript collection; an extensive microfilm collection, which includes selections of census records (mostly Ohio); vital records; and other research tools. The genealogy online service provides users full free access to subscription sites such as ancestry.com as well as internet access to free sites such as the Ellis Island records.