The northwestern half of Campbell (and a bit more of Carroll) became
Douglas County in 1870, divided on October 17 at the
Chattahoochee River. The remainder of Campbell County was ceded to Fulton County at the end of 1931, along with
Milton County, after Campbell County went bankrupt. The
legislation creating the merger was enacted on August 9, 1929, with Milton being added to the process in 1931.