Cambridge Jail - Closed
Cambridge Jail - Closed
Closed / Former County JailMailing Address
CLOSED / INACTIVE FACILITY - DO NOT SEND MAIL. Middlesex detainees are now housed at the Middlesex Jail & House of Correction in Billerica.
Physical Address
40 Thorndike Street, Cambridge, MA 02141
Governing Agency
Middlesex Sheriff's Office
Inmate ID
Inmate ID — Not required
Last Verified
September 27, 2026
Facility Mailing and Service Information
The Middlesex Sheriff's Office removed detainees from 40 Thorndike Street and no longer operates a jail there. Verify the person's current placement before sending mail.
Source: Official sourceLast verified: September 27, 2026
Do not send photos to this closed jail.
Source: Official sourceLast verified: September 27, 2026
Do not send books/packages to this closed jail.
Source: Official sourceLast verified: September 27, 2026
Do not send funds to this closed jail.
Source: Official sourceLast verified: September 27, 2026
No inmate visitation at this closed jail; verify current placement.
Source: Official sourceLast verified: September 27, 2026
How to Address Your Letter
The Middlesex Sheriff's Office removed detainees from 40 Thorndike Street and no longer operates a jail there. Verify the person's current placement before sending mail.
About Cambridge Jail - Closed
The former Middlesex jail at 40 Thorndike Street in Cambridge is closed and no longer houses detainees.