
The name, Montgomery County, along with the founding of Washington County, Maryland, after George Washington, was the first time in American history that counties and provinces in the thirteen colonies were not named after British referents.

On September 6, 1776, Thomas Sprigg Wootton from Rockville, Maryland, introduced legislation, while serving at the Maryland Constitutional Convention, to create lower Frederick County as Montgomery County.

The Maryland state legislature named Montgomery County after Richard Montgomery the county was created from lands that had at one point or another been part of Frederick County.

Montgomery County is included in the Washington–Arlington–Alexandria, DC–VA–MD–WV metropolitan statistical area, which in turn forms part of the Baltimore–Washington combined statistical area. The county seat and largest municipality is Rockville, although the census-designated place of Germantown is the most populous city within the county. As of the 2020 census, the county's population was 1,062,061, increasing by 9.3% from 2010. Montgomery County is the most populous county in the State of Maryland, located adjacent to Washington, D.C.
