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Arlington County is a county in the Commonwealth of Virginia. The county is situated in Northern Virginia on the southwestern bank of the Potomac River directly across from the District of Columbia, of which it was once a part, under the name Alexandria County. The county is coextensive with the U.S. Census Bureau's census-designated place of Arlington. Arlington County is considered to be the second-largest "principal city" of the Washington metropolitan area, although Arlington County does not have the legal designation of independent city or incorporated town under Virginia state law. In 2020, the county's population was estimated at 238,643, making Arlington the sixth-largest county in Virginia by population; if it were incorporated as a city, Arlington would be the third most populous city in the state. With a land area of 26 square miles (67 km2), Arlington is the geographically smallest self-governing county in the U.S., and by reason of state law regarding population density, it has no incorporated towns within its borders. It is the 5th highest-income county in the U.S. by median family income, and is the 11th most densely populated county in the United States. Arlington is home to the Pentagon, Reagan National Airport, and Arlington National Cemetery. In academia, the county contains Marymount University, George Mason University's Antonin Scalia Law School, the administrative offices buildings and graduate programs for the Schar School of Policy and Government and the Jimmy and Rosalynn Carter School for Peace and Conflict Resolution, as well as satellite campuses of the University of Virginia and Virginia Tech. It will soon house Amazon HQ2, the co-headquarters of Amazon.

The Office of Naval Research (ONR) is an organization within the United States Department of the Navy responsible for the science and technology programs of the U.S. Navy and Marine Corps. Established by Congress in 1946, its mission is to plan, foster, and encourage scientific research to maintain future naval power and preserve national security. It carries this out through funding and collaboration with schools, universities, government laboratories, nonprofit organizations, and for-profit organizations, and overseeing the Naval Research Laboratory, the corporate research laboratory for the Navy and Marine Corps. NRL conducts a broad program of scientific research, technology and advanced development. ONR Headquarters is in the Ballston neighborhood of Arlington, Virginia. ONR Global has offices overseas in Santiago, Sao Paulo, London, Prague, Singapore, and Tokyo.

The Defense Advanced Research Projects Agency (DARPA) is a research and development agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military. Originally known as the Advanced Research Projects Agency (ARPA), the agency was created on February 7, 1958, by President Dwight D. Eisenhower in response to the Soviet launching of Sputnik 1 in 1957. By collaborating with academia, industry, and government partners, DARPA formulates and executes research and development projects to expand the frontiers of technology and science, often beyond immediate U.S. military requirements. The name of the organization first changed from its founding name, ARPA, to DARPA, in March 1972, changing back to ARPA in February 1993, then reverted to DARPA in March 1996. The Economist has called DARPA "the agency that shaped the modern world", with technologies like "Moderna's COVID-19 vaccine ... weather satellites, GPS, drones, stealth technology, voice interfaces, the personal computer and the internet on the list of innovations for which DARPA can claim at least partial credit". Its track record of success has inspired governments around the world to launch similar research and development agencies. DARPA is independent of other military research and development and reports directly to senior Department of Defense management. DARPA comprises approximately 220 government employees in six technical offices, including nearly 100 program managers, who together oversee about 250 research and development programs. Stephen Winchell is the current director.

Al's Motors is a historic automobile dealership building located in the Ballston neighborhood of Arlington, Virginia. It was built in 1948, and is a two-story masonry building in a high-style Streamline Moderne style. There is a one-story service garage with a barrel-vaulted roof. The building features rounded corners, a metal-and-glass curtain wall opening onto the automobile showroom, overhanging aluminum cornice, and red string courses mimicking racing stripes along the parapet. The property was renovated in 2001-2002 for use as a health club.It was listed on the National Register of Historic Places in 2003.

MedStar Capitals Iceplex is the practice arena of the Washington Capitals of the National Hockey League. The highest ice rink above street-level in the United States, it is located on the eighth floor atop the parking garage adjoining the Ballston Quarter in the Ballston neighborhood of Arlington County, Virginia.Opened in 2006, the 137,000-square-foot (12,700 m2) facility, which is owned by Arlington County and leased to the Capitals, houses two full-NHL-sized ice rinks with seating for 1,200, a training center, a proshop, and offices for staff of both the Capitals team and the WNBA's Washington Mystics team. The Capitals spend about 300 hours annually practicing at the arena, which has 12,000 hours of ice time available annually. The Iceplex also serves as the home ice for the club teams of Georgetown University and George Washington University. The Iceplex also runs an adult league for amateur hockey players. It is regularly available for recreational use, and hosts "Learn to Skate" camps and lessons throughout the year.The IcePlex is also home to the NOVA Cool Cats special hockey team, which practices and has home games at the IcePlex, and the DC Sled Sharks, a sledge hockey team for physically disabled youths 18 and under, which plays in the Delaware Valley Sled Hockey League.The IcePlex served as the initial inspiration for the building of LECOM Harborcenter in Buffalo, New York by the Buffalo Sabres and Terrence Pegula. LECOM Harborcenter serves a similar purpose to the IcePlex.

Ballston Quarter, formerly known as Ballston Common Mall, originally opened as Parkington Shopping Center in 1951, and was one of the first major suburban shopping centers in the Washington, D.C., area. It was the first shopping center built around a multi-story parking garage in the United States. It is located at the intersection of Glebe Road (Virginia State Route 120) and Wilson Boulevard in the Ballston neighborhood of Arlington, Virginia, two blocks from Ballston-MU Station on the Washington Metro's Orange and Silver lines. The Ballston Common mall opened on October 20, 1986, and was a $40 million replacement for the Parkington Shopping Center. The 530,000-square-foot (49,000 m2) center was developed in limited partnership with the May Centers, a subsidiary of the May Company who, at the time, also owned one of the anchors, Hecht's.On May 31, 2016, most businesses closed so the mall could be redeveloped into Ballston Quarter. It reopened officially in November 2018.

Ballston is a neighborhood in Arlington County, Virginia. Located at the western end of the Rosslyn-Ballston corridor, Ballston is a major transportation hub, and boasts one of the nation's highest concentrations of scientific research agencies, including the Office of Naval Research, the Virginia Tech Advanced Research Institute, and the Air Force Office of Scientific Research. It is served by the Ballston–MU station on the Orange and Silver Lines of the Washington Metro.

Ballston–MU is a side-platformed Washington Metro station in Arlington County, Virginia, United States. The station opened on December 1, 1979, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). The station serves the Orange and Silver Lines. The station serves the transit-oriented community of Ballston, Ballston Quarter, and Marymount University (MU). Ballston–MU is also a major Metrobus transfer station. The station entrance is located at North Fairfax Drive and North Stuart Street, near the intersection of Wilson Boulevard and North Glebe Road. West of this station, the tracks rise above ground inside the median of Interstate 66.

First Presbyterian Church of Arlington, Virginia is a congregation in the National Capital Presbytery, the Synod of Mid-Atlantic and the Presbyterian Church (USA).

The Buckingham Historic District is a national historic district located at Arlington County, Virginia. It contains 151 contributing buildings in a residential neighborhood in North Arlington. They were built in six phases between 1937 and 1953, and primarily consist of two- and three-story, brick garden apartment buildings in the Colonial Revival-style. There is a single three-story brick building that was built in the International style. The buildings are arranged around U-shaped courtyards. The district also includes a community center, four single family dwellings, three commercial buildings and two commercial blocks.The Arlington County government gave legal protection to some of the Buckingham buildings (those in Villages 3-12 and in the commercial area) by designating them in 1993, 1994 and 2007 as components of the County's Buckingham Village Historic District, a local historic district. However, other historic Buckingham buildings, including those in Villages 1 and 2, have been demolished. The National Park Service listed the Buckingham Historic District on the National Register of Historic Places in 1999 and expanded the listing in 2004 and 2010.

Virginia Square–GMU is a side platformed Washington Metro station in the Virginia Square neighborhood of Arlington, Virginia, United States. The station opened on December 1, 1979, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). The station serves the Orange and Silver Lines. The station serves the Virginia Square neighborhood as well as the Arlington campus of George Mason University (GMU). The station entrance is located at the intersection of Fairfax Drive and North Monroe Street.

Virginia Square is a neighborhood in Arlington County, Virginia. It is centered at the Virginia Square station on the Orange and Silver lines of the Washington Metro subway system, between Clarendon and Ballston. The neighborhood consists of a mix of high-rise apartments, garden apartments, and single-family homes generally dating back to the 1930s. The Virginia Square neighborhood is home to the Arlington campus of George Mason University including its Law School, the Arlington Arts Center, some offices of the Federal Deposit Insurance Corporation (FDIC), and the main branch of the Arlington Public Library. The area's name is derived from the former Virginia Square Shopping Center (now occupied mainly by a major satellite office of the FDIC with a Giant supermarket on part of the property). Among local restaurants, Mario's Pizza has been a landmark since 1957 and El Pollo Rico since 1988.