Mule Creek State Prison
| Location | Ione, California |
|---|---|
| Coordinates | 38°22′13″N 120°57′12″W / 38.3703°N 120.9532°W |
| Status | Operational |
| Capacity | 3,284 |
| Population | 3,824 (116.4% capacity) (as of January 31, 2023) |
| Opened | June 1987 |
| Managed by | California Department of Corrections and Rehabilitation |
| Warden | Patrick Covello (Acting) |
Mule Creek State Prison (MCSP) is a California State Prison for men. It was opened in June 1987, and covers 866 acres (350 ha) 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.