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Visit montgomerycountymd.gov/311
For Emergency: 911 | Out of County: 240-777-0311

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Inmate Mailing Address
The addresses to correspond with inmates are listed by facility:

Montgomery County Correctional Facility Attn: (Inmate's Name and ID number] 22880 Whelan Lane Boyds, MD 20841

Montgomery County Detention Center Attn: [Inmate's Name and ID number] 1307 Seven Locks Road Rockville, MD 20854 If the inmate ID is needed, dial: 240-777-9730 and listen to voice prompts.

Find more information from the following link(s):
  • Inmate Mail Information


  • To speak with a Customer Service Representative, please call 311 during business hours.