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Montgomery County, Maryland

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Montgomery County, Maryland
Seal of Montgomery County, Maryland
Map of Maryland highlighting Montgomery County
Location in the state of Maryland
Map of the USA highlighting Maryland
Maryland's location in the U.S.
Founded 1776
Seat Rockville
Largest City Rockville
 - Total
 - Land
 - Water

507 sq mi (1,313 km²)
496 sq mi (1,284 km²)
12 sq mi (31 km²), 2.3%
 - (2007)
 - Density

930,813 [3]
1,876.6/sq mi (724.9/km²)
Time zone Eastern : -5/-4
County flag Flag of Montgomery County, Maryland

Montgomery County of the U.S. state of Maryland is north of Washington, D.C. and southwest of Baltimore. It is one of the richest counties in the United States,[1] and has the highest percentage (29.2%) of residents over 25 years old who hold a post-graduate degree.[2] The county seat and largest municipality is Rockville.[3]