Constitution of the State of Georgia Art. II, § 2, ¶ V

The office of any state, county, or municipal elected official shall be declared vacant upon such elected official qualifying, in a general primary or general election, or special primary or special election, for another state, county, or municipal elective office or qualifying for the House of Representatives or the Senate of the United States if the term of the office for which such official is qualifying for begins more than 30 days prior to the expiration of such official's present term of office. The vacancy created in any such office shall be filled as provided by this Constitution or any general or local law. This provision shall not apply to any elected official seeking or holding more than one elective office when the holding of such offices simultaneously is specifically authorized by law.