Trumbull County Surname Index
Trumbull County Ohio  in the Civil War 
Trumbull County Chapter of the Ohio Genealogical Society
Trumbull County, OH Genealogy Forum read and post messages about your ancestors for this county
Trumbull County, OH Genweb Project a collection of online resources for genealogy researchers
The Tombstone Transcription Project - cemeteries for Trumbull Co. OH
US GenWeb Archives for Trumbull County cemeteries, newspapers, wills, military rosters etc recorded online

Additional Resources

Ohio Newspaper Search enter your ancestor's name to instantly search the world's largest newspaper archive; over 12 million newspaper pages
Ohio Birth Records
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Ohio Divorce Records
Ohio Death Records