If you are searching for your ancestors in Fulton, DeKalb, old Milton and Rockdale Counties, you should consider Henry County. Initially, Henry was the parent county (Atlanta was in Henry County), and all records were filed in that court house. From the days when people drew land in the Georgia Lotteries to the 1850s, one might suspect to locate some information in Henry County. I have an ancestor who drew in the 1824 Land Lottery of Georgia land in downtown Atlanta, 202-1/2 acres surrounding Terminal Station. Guess where the plat was filed? Because of the far distance from Henry to Fulton, it is difficult to imagine that our ancestors were the same ones listed in Henry County deeds, estates, tax digests, plats, etc.
That situation begs the question of how difficult it must have been to travel the distance to file deeds, etc. I feel that many records went unrecorded for this reason. Something to keep in mind.
Records available on Georgia Pioneers:
Images of Wills and Bonds 1822-1834; 1834-1869; 1867-1896; Marriage contracts found in deeds and other instrumets 1822-1850; Indexes to Annal Returns, Guardian Bonds, Inventories ad Appraisements 1821-1888; indexes to lunacy records 1897-1909, indexes to Sales 1839-1941; Indexes to Vouchers 1852-1891