O.C.G.A. § 36-13-7 (2019)

The county governing authority shall have the authority to make such codes, rules, and regulations as are permitted under this chapter for: (1) The entire unincorporated area of the county; (2) Any militia district within the unincorporated area of the county; (3) Any land lot; (4) Any land and water areas 500 feet wide on either side of any state or county highway or any section of such highway within the unincorporated area of the county; (5) Any land or water areas 500 feet wide on either side of any water line of the stream or water reservoir or section thereof within the unincorporated area of the county; or (6) Any portion of the unincorporated area of the county lying within a specified distance of the boundaries of a municipality in the county.