The Montgomery County Board of Elections mailing address is: P.O. Box 4333 Rockville, MD 20849-4333. The office is located at: 18753, Suite 210 N. Frederick Avenue in Gaithersburg, 20879. The hours are as follows: Typically 8:30 AM - 5:00 PM Monday through Friday. During the 2 week period immediately prior to an election, additional hours may be added to the schedule as necessary, and may be found on the BOE home page below. Directions to the Board are also located on the web site by clicking on the address line directly under "Montgomery County Board of Elections" at the top of the page.