Statue of John Witherspoon

The Jefferson Place Gallery was an art gallery in Washington, D.C., founded in 1957 and closed in 1974. It had been located at 1216 Connecticut Street, NW in Washington, D.C.. The gallery was associated with the Washington Color School artists.

National Association of Clean Water Agencies (NACWA) represents the interests of publicly owned wastewater treatment facilities, collection systems, and stormwater management agencies before the United States Congress, several Federal agencies, and in the courts. National Association of Clean Water Agencies advocates for federal funding for clean water agencies and for responsible national policies that advance clean water and a healthy environment.

H2 USA is a hybrid organization governed by a partnership affiliated with the United States private sector economy and the public sector services. The alliance is supportive of a hydrogen economy and hydrogen technologies with a representation by more than thirty cooperatives considering associations, automakers, energy companies, fuel cell suppliers, materials and component manufacturers, national laboratories, non-governmental organizations, and the United States Department of Energy.

The São Toméan] ambassador in Washington, D.C. is the official representative of the Government in São Tomé to the Government of the United States.

Henry Wadsworth Longfellow is a bronze statue, by William Couper, and Thomas Ball. The statue depicts American poet Henry Wadsworth Longfellow. It is located at the intersection of M Street and Connecticut Avenue, N.W. Washington, D.C., and was dedicated on May 7, 1909.After the death of Henry Wadsworth Longfellow in 1882, there were several plans to memorialize him. His bust was placed at Poets' Corner in Westminster Abbey in 1884 and a statue of the poet by Franklin Simmons was unveiled in his native town of Portland, Maine, at what became known as Longfellow Square. For the statue in Washington, an association was founded to raise money for the effort, ultimately earning $21,000 by subscribers. Additionally, Congress offered another $4,000 and the site. Members of the organization included Andrew Carnegie, Henry Cabot Lodge, Charles William Eliot, Edward Everett Hale, Julia Ward Howe, and Curtis Guild. Theodore Roosevelt served as Honorary Regent. It was unveiled in 1909 by the poet's granddaughter Erica Thorp in the presence of Chief Justice Melville Fuller and the United States Marine Band.

The Peterson Institute for International Economics (PIIE), previously known as the Institute for International Economics (IIE), is an American think tank based in Washington, D.C. It was founded by C. Fred Bergsten in 1981 and is currently led by Adam S. Posen. The institute conducts research, provides policy recommendations, and publishes books and articles on a wide range of topics related to the US economy and international economics. According to the 2015 Global Go To Think Tank Index Report (Think Tanks and Civil Societies Program, University of Pennsylvania), PIIE was number 20 (of 150) in the "Top Think Tanks Worldwide" and number 13 (of 60) in the "Top Think Tanks in the United States".

Qorvis is an international Washington, D.C.-based public relations, advertising, media relations and crisis communications firm. It was acquired by the Publicis Groupe in January 2014, and became Qorvis/MSLGroup.On December 31, 2022, Qorvis was sold by Publicis to a group led by long-time Qorvis executive Matt J. Lauer.Qorvis provides public relations (PR) representation on behalf of a range of public companies, financial services firms, sovereign nations, and wealthy individuals. During the late-2000s financial crisis, Qorvis represented Wells Fargo and AIG.

The General Federation of Women's Clubs Headquarters, also known as the Miles Mansion, is a social clubhouse headquarters in Washington, D.C. Built as a private residence in 1875, it has served as the headquarters of the General Federation of Women's Clubs (GFWC) since 1922. It was declared a National Historic Landmark in 1991 for its association with the federation, which serves as an umbrella organization for women's clubs, a social movement dating to the mid-19th century. Tours of the headquarters, available by appointment, provide information about the activities of the GFWC and several historic rooms, including the 1734 entryway, the Julia Ward Howe Drawing Room, the dining room, music room and the GFWC International President's office. The headquarters also features changing exhibits of art, photographs and artifacts from its collections.

The name "M Street" refers to two major roads in the United States capital of Washington, D.C. Because of the Cartesian coordinate system used to name streets in Washington, the name "M Street" can be used to refer to any east-west street located twelve blocks north or south of the dome of the United States Capitol (not thirteen blocks, as there is no J Street). Thus, in all four quadrants of the city there are streets called "M Street", which are disambiguated by quadrant designations, namely, M Street NW, NE, SW, and SE.

The Electronic Registration Information Center (ERIC) is a nonprofit organization in the United States whose goal is to improve electoral integrity by helping states improve the accuracy of voter rolls, increase access to voter registration, reduce election costs, and increase efficiencies in elections. ERIC is operated and financed by state election agencies and chief election officials.

The Embassy of Uzbekistan in Washington, D.C., (also known as the Clarence Moore House and the Old Canadian Embassy), is the diplomatic mission of the Republic of Uzbekistan to the United States. The current ambassador of Uzbekistan to the United States is Djavlon Vahabov. The embassy is located at 1746 Massachusetts Avenue NW on Embassy Row in Washington, D.C., between Scott Circle and Dupont Circle. Constructed in 1909, the Clarence Moore House is an example of Beaux Arts architecture in blond Roman brick with limestone dressings; it was used by the Canadian government until the 1980s. The house was listed on the National Register of Historic Places (NRHP) on April 3, 1973. The building is also designated a contributing property to the Massachusetts Avenue Historic District and Dupont Circle Historic District, which are both listed on the NRHP.

The Uzbek ambassador in Washington, D.C. is the official representative of the government in Tashkent to the government of the United States.