Georgia Code Title 22. Eminent Domain § 22-2-25

(1) Personally on the owner of the property or other interest or on the representative of any owner or on any other person entitled to service;

(2) By leaving a copy of the notice at the residence of the owner, representative, or other person entitled to service; or

(3) In the case of an owner, representative, or other person entitled to service who is a nonresident, by mailing a copy to that person's last known address.

(1) Fifteen days before the day fixed for assessing the damages, the sheriff shall post the notice at the door of the courthouse of the county where the property or interest is located; and

(2) One week before the day fixed for assessing the damages, the sheriff shall cause the notice to be published once in the official organ of the county.