The Ponce Municipal Library, formally, Biblioteca Municipal Mariana Suárez de Longo, and also known as Biblioteca Publica de Ponce, is the library system of the municipality of Ponce, Puerto Rico. Founded in 1870, it is the oldest public library in Puerto Rico. The system has its main library on Miguel Pou Boulevard, in barrio San Antón, in the city of Ponce, and seven satellite library branches, three in the city's urban area and four spread out in the municipality's rural areas. The main library inaugurated a new building on Bulevar Miguel Pou in August 2007, where the former Puerto Rico District Court building was located. The central library building on Bulevar Miguel Pou was designed by Ponce architect Juan Dalmau Sambolín.