(1) Any other provisions of this chapter to the contrary notwithstanding, the board of registrars may establish additional sites as additional registrar's offices or places of registration for the purpose of receiving absentee ballots under Code Section 21-2-381 and for the purpose of voting absentee ballots under Code Section 21-2-385, provided that any such site is a branch of the county courthouse, a courthouse annex, a government service center providing general government services, or another government building generally accessible to the public.
(2) Any other provisions of this chapter to the contrary notwithstanding, in all counties of this state having a population of 550,000 or more according to the United States decennial census of 1990 or any future such census, any branch of the county courthouse or courthouse annex established within any such county shall be an additional registrar's or absentee ballot clerk's office or place of registration for the purpose of receiving absentee ballots under Code Section 21-2-381 and for the purpose of voting absentee ballots under Code Section 21-2-385.