Sosa–Carillo–Fremont House is officially listed in the National Register of Historical Places is known locally for its association with John Charles Fremont, former Territorial Governor of Arizona. The house was originally listed on the National Register as the John Charles Fremont, Casa del Gobernator, House in 1971, but the official listing name was later changed to Sosa–Carillo–Fremont House to better reflect the building's association with several important families in the region's history. The building is also known as the Carillo House, the Leopoldo Carrillo House, and the Carrillo-Frémont House. The building is now owned by the Arizona Historical Society.