Winnebago County Jail
Winnebago County Jail
County Jail / Adult Detention FacilityMailing Address
Winnebago County Jail, Rockford IL
[Inmate Full Name] — [MID#]
P.O. Box 247
Phoenix, MD 21131
[Inmate Full Name] — [MID#]
P.O. Box 247
Phoenix, MD 21131
Physical Address
650 W. State Street, Rockford, IL 61102
Phone
Governing Agency
Winnebago County Sheriff's Office
Inmate ID
MID Number — Required
Last Verified
September 27, 2026
Facility Mailing and Service Information
Use Winnebago County Jail, Rockford IL, inmate full name and MID#, P.O. Box 247, Phoenix, MD 21131.
Source: Official sourceLast verified: September 27, 2026
Inmates are limited to 10 photographs in their possession; inappropriate content is prohibited. Do not send irreplaceable originals.
Source: Official sourceLast verified: September 27, 2026
Books and magazines are not accepted in ordinary personal mail. Confirm separate publisher/vendor procedures before ordering.
Source: Official sourceLast verified: September 27, 2026
Checks, cash and money orders are prohibited in the Phoenix personal-mail route. Use current approved account-deposit methods.
Source: Official sourceLast verified: September 27, 2026
Verify current custody and Winnebago County visitation procedures before traveling.
Source: Official sourceLast verified: September 27, 2026
How to Address Your Letter
Effective May 15, 2023, personal mail must use Winnebago County Jail, Rockford IL, inmate full name and MID#, P.O. Box 247, Phoenix, MD 21131. The sender's full name and physical address are also required. Legal mail follows separate direct-jail procedures.
About Winnebago County Jail
Winnebago County Jail is located at the Criminal Justice Center at 650 W. State Street in Rockford. Personal mail is processed through TextBehind.