Mason District Governmental Center 6507 Columbia Pike, Annandale, VA22003 The Mason District Governmental Center is home to the area's Mason Police station as well as the office of…More the Mason District Supervisor Penny Gross. There are three meetings rooms in this facility that are available to book for meetings by the individuals and organizations for meetings. Rooms are available to book daily between 7am and 10pm. This building also serves as a polling location for residents of this district. A monthly newsletter is available to view on its website.