The Fond du Lac County Historical Society Research Library is available to the public by appointment only. Appointments can be made by emailing info@fdlhistory.org or calling 920-922-1166. Inquiries need to be in written form (either the above email or postal mail: P.O. Box 1284, Fond du Lac, WI 54936); please include as many details as possible in your request so we know how to best help you. Research and copies are fee-based services; please email for details. Thank you!

The following is a partial list of indexes to the materials held in the library.

• Bible Index
• Genealogies Index
• Court Records Index (1845-1940)
• Marriage Applications – Index (1899-1939)
• Military – World War I News Clipping Index
• Photos from 1910 Plat Book – Index
• Original Documents Index
• Railroad Files Index (1920’s-1930’s)
• Probate Files Index
• Grocers in Fond du Lac (By Name) 1940-1969
• Grocers in Fond du Lac (By Street) 1940-1969
• Fond du Lac Restaurants 1940-1969
• Index – Hill Obituary Scrapbook 1924-1926