The University of Denver (DU), founded in 1864, is the oldest private university in the Rocky Mountain Region of the United States. The University of Denver is a coeducational, four-year university in Denver, Colorado. DU currently enrolls approximately 11,400 students, divided between graduate and undergraduate programs. The 125-acre (0.51 km2) main campus is a designated arboretum and is located primarily in the University Neighborhood, about seven miles (11 km) south of downtown Denver.