Mule Creek State Prison is a California State Prison for men. It was opened in June 1987, and covers 866 acres located in Ione, California. The prison has a staff of 1,242 and an annual operating budget of $157 million.
As of July 31, 2022, MCSP was incarcerating people at 115.2% of its design capacity, with 3,785 occupants.
