When addressing mail to an incarcerated individual, please do the following:
Individual’s full name (and ID Number if available)
Middlesex Sheriff’s Office
269 Treble Cove Road
Billerica, MA 01862
Please make sure you have placed a handwritten return address on the top left corner of the envelope as stickers will be removed. You should not write or place anything else on the outside of the envelope. Ensure proper postage as it will be returned to you by the Post Office if there is an insufficient amount.