Severely Mentally Ill Persons in Jails and Prisons in 2000
| Year | 2000 |
| Total number of inmates | 1,937,482 |
| Number of severely mentally ill inmates, according to the lowest estimated percentage (16%)* | 309,997 |
| U.S. population | 273,600,000 |
| Severely mentally ill inmates/100,000 population | 113 |
* According to the most recent methodologically sound estimate of the number of severely mentally ill (major depression, schizophrenia and other psychotic disorders, and bipolar disorder) inmates, which ranged from 16% to 24%.