Rockville is a city in and the county seat of Montgomery County, Maryland, United States, and is part of the Washington metropolitan area. The 2020 census tabulated Rockville's population at 67,117, making it the fourth-largest incorporated city in Maryland.
Stone marker on corner of Vinson Street and Maryland Avenue, placed there in 1803 when Rockville's streets were laid out. "BR" stands for "Beginning of Rockville".[citation needed]