Mercer County Jail
Mercer County Jail
County Jail / Adult Detention FacilityMailing Address
[Inmate Full Legal / Booked Name] — [Inmate ID Number if known]
Mercer County Jail
906 S.W. 3rd Street
Aledo, IL 61231
Mercer County Jail
906 S.W. 3rd Street
Aledo, IL 61231
Physical Address
906 S.W. 3rd Street, Aledo, IL 61231
Phone
Governing Agency
Mercer County Sheriff's Office
Inmate ID
Inmate ID Number — 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 place 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 or video-visitation schedule before traveling.
Source: Official sourceLast verified: September 27, 2026
How to Address Your Letter
Verify the person is currently housed at Mercer County Jail before mailing.
Use:
[Inmate Full Legal / Booked Name] — [Inmate ID Number if known]
Mercer County Jail
906 S.W. 3rd Street
Aledo, IL 61231
Include the sender's complete first and last name and return address. Confirm current local restrictions before sending photos, publications, packages, money or irreplaceable originals.
Use:
[Inmate Full Legal / Booked Name] — [Inmate ID Number if known]
Mercer County Jail
906 S.W. 3rd Street
Aledo, IL 61231
Include the sender's complete first and last name and return address. Confirm current local restrictions before sending photos, publications, packages, money or irreplaceable originals.
About Mercer County Jail
Mercer County Jail is a current 102-bed county jail at 906 S.W. 3rd Street in Aledo.