This study obtained information about inpatient treatment modalities used at ten state facilities in Missouri; they consisted of five state hospitals, three mental health centers, and two schools for the retarded. For a random sample of inpatients drawn from a statewide computerized file, records were kept of the time each patient spent in any of 26 treatment modalities for seven consecutive days. Weekly hours of structured treatment were highest at the schools for the retarded (25.46 hours), followed by mental health centers (18.48), and state hospitals (14.63). Among all ten facilities, vocational-educational therapy was used most intensively, followed by recreational therapy. Differences related to sex and chronicity of patients are discussed.