The Montgomery County Circuit Court's License Department (50 Maryland Avenue, North Tower, 1st Floor, Rm 1300, Rockville, MD) can answer any questions about applying for a marriage license, marriage ceremonies, certified copies, correcting marriage records, information about divorce including how to obtain a divorce decree (if divorce happened in Montgomery County). The office phone number is 240.777.9460, or 240.777.9426.
See links below for additional information and how to order online.