The University of Denver is a private research university in Denver, Colorado, United States. Founded in 1864, it has an enrollment of approximately 5,700 undergraduate students and 7,200 graduate students. It is classified among "R1: Doctoral Universities – Very high research activity". The 125-acre main campus is a designated arbore…The University of Denver is a private research university in Denver, Colorado, United States. Founded in 1864, it has an enrollment of approximately 5,700 undergraduate students and 7,200 graduate students. It is classified among "R1: Doctoral Universities – Very high research activity". The 125-acre main campus is a designated arboretum and is located primarily in the University Neighborhood, about five miles south of downtown Denver.