Jefferson County Justice Center / Jail
Jefferson County Justice Center / Jail
County Jail / Adult Detention FacilityMailing Address
[Inmate Full Legal / Booked Name] — [Inmate / Booking Number if known]
Jefferson County Justice Center
911 Casey Avenue
Mount Vernon, IL 62864
Jefferson County Justice Center
911 Casey Avenue
Mount Vernon, IL 62864
Physical Address
911 Casey Avenue, Mount Vernon, IL 62864
Phone
Governing Agency
Jefferson County Sheriff's Office
Inmate ID
Inmate / Booking Number — Not required
Last Verified
September 27, 2026
Facility Mailing and Service Information
Use the inmate's full booked/legal name and identifying number when known. Include the sender's complete first and last name and return address.
Source: Official sourceLast verified: September 27, 2026
Confirm the current photograph size, quantity and content restrictions before mailing. Do not send irreplaceable originals.
Source: Official sourceLast verified: September 27, 2026
Confirm current publisher/vendor, binding and package rules before ordering books, magazines, newspapers or parcels.
Source: Official sourceLast verified: September 27, 2026
Do not send cash in ordinary correspondence unless specifically authorized. Use the facility's current approved inmate-account deposit method.
Source: Official sourceLast verified: September 27, 2026
Verify current custody, visitor approval/registration requirements and the current visitation/video-visitation schedule before traveling.
Source: Official sourceLast verified: September 27, 2026
How to Address Your Letter
Verify the person is currently housed at Jefferson County Justice Center / Jail before mailing.
Use:
[Inmate Full Legal / Booked Name] — [Inmate / Booking Number if known]
Jefferson County Justice Center
911 Casey Avenue
Mount Vernon, IL 62864
Include the sender's complete first and last name and return address.
Use:
[Inmate Full Legal / Booked Name] — [Inmate / Booking Number if known]
Jefferson County Justice Center
911 Casey Avenue
Mount Vernon, IL 62864
Include the sender's complete first and last name and return address.
About Jefferson County Justice Center / Jail
Jefferson County Sheriff's Office and current county detention operation are at 911 Casey Avenue in Mount Vernon. The source database's Edwardsville address was incorrect.