O.C.G.A. § 9-10-32

Where the maker and endorser of a promissory note who reside in different counties are subjected to an action in the county where the maker resides, as provided by Article VI, Section II, Paragraph V of the Constitution of this state, service of a copy of the original pleading and process on the endorser, as provided in the case of joint obligors and promisors, shall be deemed sufficient.