Oakhill Correctional Institution
Oakhill Correctional Institution
Minimum-Security Correctional InstitutionMailing Address
[PIOC Full Name] — DOC #[Number]
Oakhill Correctional Institution
P.O. Box 189
Phoenix, MD 21131
Oakhill Correctional Institution
P.O. Box 189
Phoenix, MD 21131
Physical Address
5212 County Road M, Oregon, WI 53575
Governing Agency
Wisconsin Department of Corrections
Inmate ID
Wisconsin DOC Number — Required
Last Verified
September 29, 2026
Facility Mailing and Service Information
All non-privileged personal mail must include the PIOC's full first and last name, Wisconsin DOC number, and full facility name, and be sent to P.O. Box 189, Phoenix, MD 21131. Mail is photocopied by Wisconsin DOC's third-party mail-processing vendor; personal mail sent directly to the institution is returned.
Source: Official sourceLast verified: September 29, 2026
Personal photographs sent through ordinary correspondence are processed under Wisconsin DOC's current incoming-mail rules. Verify current image/content restrictions before sending.
Source: Official sourceLast verified: September 29, 2026
Legal mail, publications, subscriptions, and property/packages do not use the Phoenix personal-mail address. Use the facility-specific legal/publication/package address and approved-vendor rules shown by Wisconsin DOC.
Source: Official sourceLast verified: September 29, 2026
Do not send inmate funds in ordinary personal mail. Use Wisconsin DOC-approved money/deposit procedures.
Source: Official sourceLast verified: September 29, 2026
Visitors must be approved and follow the current facility-specific visiting schedule and rules.
Source: Official sourceLast verified: September 29, 2026
How to Address Your Letter
All non-privileged personal mail must include the PIOC's full first and last name, Wisconsin DOC number, and full facility name, and be sent to P.O. Box 189, Phoenix, MD 21131. Mail is photocopied by Wisconsin DOC's third-party mail-processing vendor; personal mail sent directly to the institution is returned.
About Oakhill Correctional Institution
Oakhill Correctional Institution is listed as a current Wisconsin DOC adult facility. Non-privileged personal mail is routed through P.O. Box 189 in Phoenix, Maryland; legal mail and packages use facility-specific Wisconsin addresses.