Montgomery County of the U.S. state of Maryland is situated just north of Washington DC. and southwest of Baltimore. It has the highest percentage (29.2%) of residents over 25 years old who hold a post-graduate degree. The county seat and largest municipality is Rockville. Most of the county’s residents live in unincorporated locales, the most populous of which are Silver Spring and Bethesda. It is a part of both the Washington Metropolitan Area and the Baltimore-Washington Metropolitan Area.