While the Secretary of State’s Office does not oversee municipal annexations, annexation documents must be filed with the Secretary of State’s Office pursuant to S.C. Code of Laws §5-3-10 et. seq.
Municipalities must file a notice with the Secretary of State, Department of Transportation, and Department of Safety that includes a written description of the boundary and a map or plat which clearly defines the areas added to the municipality.
SC Secretary of State's Office
Attn: Municipal Annexations
1205 Pendleton Street, Suite 525
Columbia, SC 29201