Macon County Courthouse Oglethorpe GA.
Macon County was created in 1837 from Houston and Marion counties, effective December 14 of that year. The 91st county, it was named for the recently deceased General Nathaniel Macon of North Carolina, who served in the U.S. Congress for 37 years and ran for U.S. vice president. (The city of Macon, Georgia was also named for him, but is actually the seat of another county.) Parts of the county were used to create Taylor and Peach counties, in 1852 and 1924 respectively.
You should update the OP with which counties have been done.