The three largest inpatient psychiatric facilities in the U.S. are the Los Angeles County Jail, Rikers Island Jail in New York City, and: A Dade County Jail, Miami B Harris County Jail, Houston C Cook County Jail, Chicago D Fulton County Jail, Atlanta E Allegheny County Jail, Pitsburgh

C Cook County Jail, Chicago<br /><br />The Cook County Jail in Chicago is often cited as one of the largest inpatient psychiatric facilities in the United States, alongside the Los Angeles County Jail and Rikers Island Jail in New York City. These facilities house a significant number of individuals with mental health issues, highlighting the intersection of mental health and the criminal justice system.