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Montgomery County, Maryland

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Montgomery County, Maryland
Montgomery County, Maryland[1]
Downtown Rockville in 2001, the Black Rock Mill in 2006, the National Naval Medical Center in 2003, Shady Grove in 2004, and the Gaithersburg city hall in 2007.
Downtown Rockville in 2001, the Black Rock Mill in 2006, the National Naval Medical Center in 2003, Shady Grove in 2004, and the Gaithersburg city hall in 2007.
Flag of Montgomery County, Maryland
Official seal of Montgomery County, Maryland
Coat of arms of Montgomery County, Maryland
"Gardez Bien"
(English: Watch Well)
Location in the U.S. state of Maryland
Location in the U.S. state of Maryland
Country United States of America
State Maryland
FoundedSeptember 6, 1776[2][3]
Named forRichard Montgomery
 • ExecutiveIsiah Leggett (D)
 • Total507 sq mi (1,310 km2)
 • Land491 sq mi (1,270 km2)
 • Water16 sq mi (40 km2)  3.1%
 • Total1,058,810
 • Density2,156/sq mi (832/km2)
Demonym(s)Montgomery Countyan, MoCoite
Time zoneUTC-5 (Eastern (EST))
 • Summer (DST)UTC-4 (EDT)
20812, 20813, 20814, 20815, 20816, 20817, 20818, 20824, 20825, 20827, 20830, 20832, 20833, 20837, 20838, 20839, 20841, 20842, 20847, 20848, 20849, 20850, 20851, 20852, 20853, 20854, 20855, 20859, 20860, 20861, 20862, 20866, 20868, 20871, 20872, 20874, 20875, 20876, 20877, 20878, 20879, 20880, 20882, 20883, 20884, 20885, 20886, 20891, 20895, 20896, 20898, 20901, 20902, 20903, 20904, 20905, 20906, 20907, 20908, 20910, 20911, 20912, 20913, 20914, 20915, 20916, 20918
Area code(s)240, 301
Seat (and largest city) Rockville
Congressional districts3rd, 6th, 8th

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,[4] and has the highest percentage (29.2%) of residents over 25 years old who hold a post-graduate degree.[5] The county seat and largest municipality is Rockville.[6]


  1. "County Charter".
  2. "Montgomery County Centennial: An Old-Fashioned Maryland Reunion". The Baltimore Sun. September 7, 1876. p. 1.
  3. Proceedings of the Conventions of the Province of Maryland, 1774-1776, vol. 78, Archives o contained within the bounds and limits following, to wit : beginning at the east side of the mouth of Rock creek on Potowmac river, and running with the said river to the mouth of Monocacy, then with a straight line to Par's spring, from thence with the lines of the county to the beginning, shall be and is hereby erected into a new county by the name of Montgomery county.", September 6, 1776, p. 242
  4. [1]
  5. "US Census Bureau: R1403. Percent of People 25 Years and Over Who Have Completed an Advanced Degree: 2004". Archived from the original on 12 February 2020. Retrieved 2 January 2009.
  6. "Archived copy". Archived from the original on 2009-02-26. Retrieved 2009-01-02.((cite web)): CS1 maint: archived copy as title (link)
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Montgomery County, Maryland
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