Callahan Co. Genealogy Forum read and post messages about your ancestors for this county
Callahan County,  Confederate Pension Applications
Callahan County, TX Genweb Project a collection of online resources for genealogy researchers
Land Survey Abstract Indices of the Original Land Owners of Texas - Callahan County
The Tombstone Transcription Project - cemeteries for Callahan Co. TX
US GenWeb Archives for Callahan County cemeteries, newspapers, wills, military rosters etc recorded online
World War II Honor List of Dead and Missing Army and Army Air Forces Personnel - Callahan County

Additional Resources

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