Sugarloaf Mound is the sole remaining Mississippian culture platform mound in St. Louis, Missouri, a city commonly referred to in its earlier years as "Mound City" for its approximately forty Native American earthen structures. Sugarloaf Mound is the last remaining of the mounds built within present-day St. Louis by a Native American culture that thrived in the area from A.D. 600-1300. The mound itself is the oldest human-made structure in the city of St. Louis.