The University of Denver (DU) is a coeducational, four-year university in Denver, Colorado. Founded in 1864, it is the oldest independent private university in the Rocky Mountain Region of the United States. DU enrolls approximately 5,600 undergraduate students and 6,100 graduate students. The 125-acre main campus is a designated arboretum and is located primarily in the University Neighborhood, about five miles (8 km) south of downtown Denver.