Martinez Detention Facility

The Martinez Detention Facility (MDF) opened in 1981 and is one of three detention facilities operated by the Contra Costa County Office of the Sheriff. The MDF is a maximum security facility and the primary point of intake for all arrestees booked in Contra Costa County.

The MDF houses a diverse population of both pre-sentenced and sentenced inmates who do not qualify for less restrictive environments.

The MDF administration and staff work in collaboration with many community-based organizations to provide educational and rehabilitative programs for the inmates. The MDF also offers a broad range of medical and psychiatric services to the inmates provided by physicians, psychiatrists, dentists, nurses, and mental health clinicians.

The MDF staffing consists of both sworn and professional staff members (assigned to operational and support roles) who work diligently to provide a safe and clean housing environment for inmates.


1000 Ward Street
Martinez, CA  94553
(925) 335-4600


Visiting Hours

Monday, Tuesday, Wednesday, Saturday, and Sunday:

  • 8:30 a.m. - 11:00 a.m.
  • 1:00 p.m. - 5:00 p.m.
  • 7:30 p.m. - 9:00 p.m.


  • 8:30 a.m. - 11:00 a.m.
  • 1:00 p.m. - 5:00 p.m.


  • 7:30 p.m. - 9:00 p.m.

Up to four visitors may visit an inmate at one time and all visitors must be scheduled and enter the facility no later than 30 minutes prior to the end of any visiting block.  Registration of scheduled visitors will begin 30 minutes before the posted visiting time. Visitors are required to have their visit slip time stamped and in the tray 30 minutes prior to their visit.