Delaware County Courthouse Square District is a national historic district located at Delhi in Delaware County, New York. The district contains 18 contributing buildings and one contributing structure. It consists of a distinctive and unspoiled grouping of 19th century governmental, commercial, and religious structures built around the village green. It includes the county courthouse and clerk's office, the sheriff's office and jail, and a bandstand. It also includes the buildings surrounding the green. The  2 1⁄2-story brick courthouse building was designed by Isaac G. Perry and features a mansard roof. Also within the district are the Presbyterian church (1831) and Bank building (1838).