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FamilySearch Wiki - Mercer County, Ohio.

Free online genealogical research guide for Mercer County, Ohio.

Genealogy Inc. - Mercer County, Ohio Facts, Genealogy, Records & Links

Linkpendium - Mercer County, Ohio

Mercer County, Ohio, Genealogy

Original website for Mercer Co., OH, Genealogy, begun July 1996, mounted in cooperation with the local genealogical society.

Midwest OHio GENealogy on the WEB Network

Miami Valley, Ohio counties included in Region 7 of the Local Government Records project: Auglaize, Champaign, Clark, Darke, Greene, Logan, Mercer, Miami, Montgomery, Preble, Shelby.

NACo (National Association of Counties) - County Explorer

Official County Web Site

The Farm Journal illustrated directory of Mercer County, Ohio, 1916

USGenWeb

USGenWeb Archives