This courthouse is one of four extant Texas courthouses designed by Leslie L. Thurmon of Dallas (the others are in Jeff Davis, Henderson, and Franklin counties). The modest, two-story, Classical Revival building of tan brick has accents of sandstone and red brick made in D’Hanis, about seventy-five miles east. Belt courses of sandstone define both floors, and red brick quoins frame the building’s octagonal corner pavilions. The cupola and the octagonal, metal dome contain a four-sided clock supported by paired pilasters and pediments. Each of Thurmon’s courthouse designs takes a different approach to the typical cross-axial plan.
Stone commercial buildings around the courthouse square give it a movie set western ambiance. At 503 S. Ann, the two-story stone Las Moras Masonic Lodge (former Kinney County Courthouse of 1879), commercial buildings in the 100 block of W. Spring Street, and the William Patrick Building (1885; 114 North Street) reinforce this picturesque appearance.