The University of Denver (DU) is a private research university in Denver, Colorado. Founded in 1864, it is the oldest independent private university in the Rocky Mountain Region of the United States. It is classified among "R1: Doctoral Universities – very high research activity". DU enrolls approximately 5,700 undergraduate students and 7,200 graduate students. The 125-acre (0.51 km2) main campus is a designated arboretum and is located primarily in the University Neighborhood, about five miles (8 km) south of downtown Denver. The 720-acre Kennedy Mountain Campus is located approximately 110 miles northwest of Denver, in Larimer County.