Baltimore-Washington Metropolitan Area
Coordinates: 38°58?N 77°19?W / 38.97°N 77.32°W Coordinates: 38°58?N 77°19?W / 38.97°N 77.32°W Country United States State - District of Columbia - Maryland - Virginia - Pennsylvania - West Virginia Constituent Metropolitan Areas Washington Metropolitan Area
Baltimore Metropolitan Area Principal cities Washington, D.C. Arlington, VA Alexandria, VA Baltimore, MD, Annapolis, MD Bethesda, MD Chambersburg, PA Columbia, MD Easton, MD Fairfax, VA Falls Church, VA Frederick, MD Fredericksburg, VA Gaithersburg, MD Hagerstown, MD Lexington Park, MD Martinsburg, WV Rockville, MD Reston, VA Silver Spring, MD Towson, MD Tysons, VA Waynesboro, PA Winchester, VA Population
o CSA 9,764,315 ( 4th) Time zone UTC-5 ( EST) o Summer ( DST) UTC-4 ( EDT)
Map of the current
-designated Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area.
Baltimore-Washington metropolitan area (Baltimore-Washington Metropolitan Combined Statistical Area) is a combined statistical area consisting of the overlapping labor market region of the cities of Washington, D.C. and Baltimore, Maryland. The region includes Central Maryland, Northern Virginia, three counties in the Eastern Panhandle of West Virginia, and one county in South Central Pennsylvania. It is the most educated, highest-income, and fourth largest combined statistical area in the United States.  
Officially, the area is designated by the
Office of Management and Budget (OMB) as the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. It is composed primarily of two major metropolitan statistical areas (MSA), the Washington-Arlington-Alexandria, DC-VA-MD-WV MSA and the Baltimore-Columbia-Towson, MD MSA. In addition, six other smaller urban areas not contiguous to the main urban area but having strong commuting ties with the main area are also included in the metropolitan area. These are: the  Hagerstown-Martinsburg, MD-WV MSA, the Chambersburg-Waynesboro, PA MSA, the Winchester, VA-WV MSA, the California-Lexington Park, MD MSA, the Easton, MD micropolitan statistical area (µSA), and the Cambridge, MD µSA.
Some counties such as
Caroline and King George County, Virginia are not officially designated by the OMB as members of this metropolitan area, but still consider themselves members anyway.     This is mostly due to their proximity to the area, the size of their commuter population, and by the influence of local broadcasting stations. The population of the entire Washington-Baltimore Combined Statistical Area as of the  Census Bureau's 2012 Population Estimates is 9,331,587.      
The most populous city is Washington, DC, with a population of 681,170.  The most populous county is  Fairfax County, Virginia, with a population exceeding 1.1 million.
Components of the metropolitan area
The counties and independent cities and their groupings that comprise the
metropolitan area are listed below with their 2012 population estimates. Central counties/cities (designated as such by OMB) for each MSA are shown in italics.
Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Area (5,860,342) Silver Spring-Frederick-Rockville, MD Metropolitan Division (1,244,291)
Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Division (4,616,051)
Washington, District of Columbia
Calvert County, Maryland
Charles County, Maryland
Prince George's County, Maryland
Arlington County, Virginia
Clarke County, Virginia
Culpeper County, Virginia
Fairfax County, Virginia
Fauquier County, Virginia
Loudoun County, Virginia
Prince William County, Virginia
Rappahannock County, Virginia
Spotsylvania County, Virginia
Stafford County, Virginia
Warren County, Virginia
Falls Church, Virginia
Manassas Park, Virginia Jefferson County, West Virginia
Baltimore-Columbia-Towson, MD Metropolitan Area (2,753,149)
Hagerstown-Martinsburg, MD-WV Metropolitan Area (256,278)
Chambersburg-Waynesboro, PA Metropolitan Area (151,275)
Winchester, VA-WV Metropolitan Area (130,907)
California-Lexington Park, MD Metropolitan Area (108,987)
Easton, MD Micropolitan Area (38,098)
Cambridge, MD Micropolitan Area (32,551)
Metropolitan Washington Council of Governments
Founded in 1957, the
Metropolitan Washington Council of Governments (MWCOG) is a regional organization of 23 Washington-area local governments, as well as area members of the Maryland and Virginia state legislatures, the U.S. Senate, and the U.S. House of Representatives. MWCOG provides a forum for discussion and the development of regional responses to issues regarding the environment, transportation, public safety, homeland security, affordable housing, community planning, and economic development. 
National Capital Region Transportation Planning Board, a component of MWCOG, is the federally designated Metropolitan Planning Organization for the metropolitan Washington area. 
Baltimore Metropolitan Council
The Baltimore Metropolitan Council is the equivalent organization for the Baltimore portion of the combined Baltimore-Washington metropolitan area.
The BMC, which was created in 1992 as the successor to the Regional Planning Council and Baltimore Regional Council of Governments, consists of the Baltimore region's elected executives, representing Baltimore City and Anne Arundel, Baltimore, Carroll, Harford and Howard counties.  
Baltimore Regional Transportation Board is the federally recognized Metropolitan Planning Organization for transportation planning in the Baltimore region. 
List of principal cities
See List of cities in the Baltimore-Washington metropolitan area for a full list. 
Bel Air, Maryland
Brooklyn Park, Maryland
Curtis Bay, Maryland
Ellicott City, Maryland
Glen Burnie, Maryland
Middle River, Maryland
Owings Mills, Maryland
Perry Hall, Maryland
Severna Park, Maryland
Westminster, Maryland Woodlawn, Maryland
Washington, District of Columbia
Chevy Chase, Maryland
College Park, Maryland
Silver Spring, Maryland
Upper Marlboro, Maryland
Falls Church, Virginia
Great Falls, Virginia
Manassas Park, Virginia
Mt. Vernon, Virginia
Tysons, Virginia Vienna, Virginia
Not limited to its proximity to the
National Institutes of Health in Bethesda, Maryland's Washington suburbs are a major center for biotechnology. Prominent local biotechnology companies include MedImmune, United Therapeutics, The Institute for Genomic Research, Human Genome Sciences and the Howard Hughes Medical Institute.
Many defense contractors are based in Northern Virginia and Montgomery County, Maryland to be close to
the Pentagon in Arlington. Local defense contractors include Lockheed Martin, the largest, as well as Northrop Grumman, General Dynamics, BAE Systems Inc., Computer Sciences Corporation (CSC), Booz Allen Hamilton, Leidos, Science Applications International Corporation (SAIC), and Orbital Sciences Corporation.
Notable company headquarters in the region
Fortune 500 ranking.
The Capital Beltway (I-495) in Northern Virginia
The Baltimore Metro subway
Rail transit systems
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^ As according to
Federal Aviation Administration CY 2011 Enplanement Data, BWI exceeded Dulles by less than 24,000 passengers. As of 2010 , however, Dulles has an edge in international traffic.