Located in Billerica, Massachusetts The Middlesex Jail and House of Correction serves Middlesex County, Massachusetts. Men are housed here awaiting trial or serving sentences up to 2 ý years. The jail also houses women classified to the Middlesex Sheriff's pre-release center
Originally built on a 350-acre farm in Billerica, Massachusetts, the facility was to replace a condemned jail 15 miles away in East Cambridge, Massachusetts. The facility originally could hold over 300 prisoners, cost $837,000 to build, and was completed in December 1931.
On December 9, 2024, the Middlesex Sheriff's Office installed a free vending machine filled with Naloxone inside of the facility's visitor center. Within the first year of operation the machine was used 205 times.