Courthouses in Gaston, South Carolina, the US. Courthouses locations in Gaston, South Carolina. Find the nearest courthouses locations, near you. All types of business services ATM Courthouse Finance Insurance Real estate School All courthouses in Gaston Calhoun County Magistrate Courthouse +1 803-794-4706 1724 Old State Road, Gaston, South Carolina 29053 Write a review Phone Website Directions