Delaware County, OH Genweb Project a collection of online resources for genealogy researchers
Delaware County, OH Genealogy Forum read and post messages about your ancestors for this county
Delaware County Ohio  Historical Society and Genealogical Society
Delaware County Burials   over 60,000 burials listed
Delaware County Pioneers
The Tombstone Transcription Project - cemeteries for Delaware Co. OH
US GenWeb Archives for Delaware County cemeteries, newspapers, wills, military rosters etc recorded online
1850 Delaware Census
96th OVI Civil War Roster

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
Ohio Marriage Records
Ohio Divorce Records
Ohio Death Records