Saint John County, FL Genweb Project a collection of online resources for genealogy researchers
Saint John County Message Board read and post messages with other genealogy researchers of this county
St Johns's Co; St. Augustine National Cemetery partial listing
St. Johns, Duval and Clay Counties.  1883 Pension Files
St Johns's County 1850 Florida Census
The Tombstone Transcription Project - cemeteries for Saint John Co. FL
US GenWeb Archives for Saint John County cemeteries, newspapers, wills, military rosters etc recorded online
1850 Census of St Johns County

Additional Resources

Florida Obituary Search enter your ancestor's name to search the world's largest newspaper obituary archive; over 3 Billion newspaper articles
Florida Birth Records
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Florida Death Records