This is the "Seneca County" page of the "Northwest Ohio Genealogy Research by County" guide.
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Last Updated: Jun 24, 2014 URL: Print Guide RSS Updates

Seneca County Print Page

General Information

Established: 12 February 1820
County Seat: Tiffin


Local Government Records

Counties, townships, and cities all keep records of interest to family historians. Probate Court records include Births and Deaths (first recorded in 1867), marriages, wills, and guardianships. Naturalization records may also be found here as well as in the Court of Common Pleas. For a full listing of offices, see Seneca County Guide to Local Government Records .

Researchers interested in contemporary records, or any record not listed here on the CAC's inventories should contact the Seneca County Courthouse for more information.


Geographical Names

  • Adams
  • Adams Township
  • Adrian
  • Adrian Township
  • Alvada
  • Amsden
  • Angus
  • Attica
  • Bascom
  • Bascom Township
  • Berwick
  • Betts
  • Bettsville
  • Big Spring
  • Big Spring Township
  • Bloom
  • Bloom Township
  • Bloomville
  • Butternut Ridge
  • Caroline
  • Carrothers
  • Castana
  • Clinton Township
  • Cooper
  • Cromers
  • Eden
  • Eden Township
  • Fireside
  • Fitz Henry
  • Flat Rock
  • Fort Ball
  • Fort Seneca
  • Fosters Mill
  • Fostoria
  • Frank
  • Green Springs
  • Green Springs Township
  • Hopewell Township
  • Iler
  • Jackson Station
  • Jackson Township
  • Kansas
  • Leamansville
  • Lindon
  • Loudon
  • Loudon Township
  • Maple Grove
  • Melmore
  • Morris
  • New Riegel
  • New Riegel Township
  • Oakley
  • Old Fort
  • Omar
  • Palo Alto
  • Pleasant Township
  • Reed Township
  • Reedtown
  • Republic
  • Risdon
  • Rockaway
  • Saint Nicholas
  • Saint Stephen
  • Saw Mill
  • Scipio
  • Scipio Siding
  • Seneca Township
  • Siam
  • South Bloom
  • Springville
  • Stoner
  • Thomspon Township
  • Tiffin
  • Trumbo
  • Venice
  • Viona
  • Watson
  • Watsons Cross Roads
  • Watsons Station
  • West Lodi

Active post offices in bold.



Search the BGSU Libraries online catalog for Seneca County, Ohio histories and atlases. The following indexes have been compiled and are available for use at the Center for Archival Collections.

  • Index to Wills and Estates, 1851 thru 1900. CAC OG F497.S4D67 1989
  • Marriages of Seneca County, Ohio, 1841-1899. CAC OG F497.S4S43 1994
  • Original Land Entries of Seneca County, Ohio. CAC OG F497.S4B74 1991
  • Ottawa, Sandusky, and Seneca Counties, Ohio, Newspaper Obituary Abstracts, 1836-1870.CAC OG F497.A18M55
  • Pleasant Union Cemetery, Old Fort, Seneca County, Ohio. CAC OG F497.S4P55
  • Seneca County, Ohio Chancery Records Court Index, 1825-1860. CAC OG F497.S4S44 1991
  • Seneca County, Ohio Cemetery Inscriptions. CAC OG F 497.S4S45 1987
  • Index to Coroners' Inquests, 1883-1935, 1950. (pOG 3483)

Most local government record volumes are indexed at the front of each volume. Some separate indexes have been prepared and form part of the local record series. These include:

  • Marriage Records, 1841-1930, 2r (#90-91)
  • Birth Registrations and Corrections, 1867+, 1r (#67)
  • Will Records, n.d., 1r (#107)

Subject Guide

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Newspapers are useful to genealogical research because of the obituaries and community news appearing in them. The following communities published newspapers with information relating to Seneca County residents. To see the CAC's holdings for each title, go to the Guide to Newspaper Holdings, select the letter the city name begins with and scroll down or use your browser's search function to locate the description of the newspapers. Newspapers may also be located at your local public library or at the Ohio Historical Society.

  • Attica
  • Bloomsville
  • Fostoria
  • Green Springs
  • Kansas
  • Republic 
  • Tiffin

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