American University had a total enrollment of 12,321 students in 2024. The full-time enrollment at American University is 10,136 students and the part-time enrollment is 2,185. This means that 82.3% of students enrolled at American University are enrolled full-time.

The enrolled student population at American University, both undergraduate and graduate, is 49.8% White, 13.1% Hispanic or Latino, 9.63% Black or African American, 6.65% Asian, 4.88% Two or More Races, 0.0568% Native Hawaiian or Other Pacific Islanders, and 0.0487% American Indian or Alaska Native.

Students enrolled at American University in full-time Undergraduate programs are most commonly White Female (34.6%), followed by White Male (21%) and Hispanic or Latino Female (8.45%). Students enrolled in full-time Graduate programs are most commonly White Female (28.1%), followed by White Male (17%) and Hispanic or Latino Female (7.71%).