Getty Images / Scott Olson
Two women walk toward a visitor's entrance of a maximum security detention area of the Cook County jail February 12, 2006 in Chicago, Illinois.
Under the plan approved Tuesday, the new guards would be hired by early next year.
The hiring push comes about 18 months after the U.S. Justice Department released a scathing report on conditions at the Cook County Jail. County officials say it's part of an overall plan to end federal court supervision of the jail in two to four years.