Peterson Institute for International Economics

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.

The Papua New Guinean ambassador in Washington, D. C. is the official representative of the Government in Port Moresby to the Government of the United States.

The American Association of Suicidology (AAS) is a 501(c)(3) nonprofit organization which advocates for suicide prevention. It was established in 1968 by Edwin S. Shneidman, who has been called "a pioneer in suicide prevention." Its official journal is Suicide and Life-Threatening Behavior, published six times a year by Wiley-Blackwell.

The Brookings Institution, often stylized as simply Brookings, is an American research group founded in 1916. Located on Think Tank Row in Washington, D.C., the organization conducts research and education in the social sciences, primarily in economics (and tax policy), metropolitan policy, governance, foreign policy, global economy, and economic development. Its stated mission is to "provide innovative and practical recommendations that advance three broad goals: strengthen American democracy; foster the economic and social welfare, security and opportunity of all Americans; and secure a more open, safe, prosperous, and cooperative international system."Brookings has five research programs at its Washington campus: Economic Studies, Foreign Policy, Governance Studies, Global Economy and Development, and Metropolitan Policy. It also established and operates three international centers which are based in Doha, Qatar (Brookings Doha Center, and since 2021, the Middle East Council on Global Affairs or MECGA); Beijing, China (Brookings-Tsinghua Center for Public Policy, and since 2020, the Brookings-Tsinghua China Office at Tsinghua University); and New Delhi, India (Brookings India, and since 2020, the Centre for Social and Economic Progress or CSEP).The University of Pennsylvania's Global Go To Think Tank Index Report has named Brookings "Think Tank of the Year" and "Top Think Tank in the World" every year since 2008. The Economist describes Brookings as "perhaps America’s most prestigious think-tank."Brookings states that its staff "represent diverse points of view" and describes itself as nonpartisan, and various media outlets have alternately described Brookings as centrist, liberal, or right-wing. An academic analysis of congressional records from 1993 to 2002 found that Brookings was cited by conservative politicians almost as often as by liberal politicians, earning a score of 53 on a 1–100 scale, 100 representing the most liberal score. The same study found Brookings to be the most frequently cited think tank by U.S. media and politicians.

The Paul H. Nitze School of Advanced International Studies (SAIS) is a specialist graduate school of Johns Hopkins University devoted to the study of international relations, diplomacy, and public policy. SAIS has additional campuses in Bologna, Italy, and Nanjing, China. The Nitze School was established in 1943 by Paul H. Nitze and Christian Herter who were seeking new methods of preparing men and women to cope with the international responsibilities that would be thrust upon the United States in the post-World War II world. Nitze feared the diplomatic and economic expertise developed in World War II might get lost if the nation became isolationist. Originally founded as a standalone graduate school, it became a part of The Johns Hopkins University in 1950.The SAIS Washington, D.C. campus is located on Massachusetts Avenue NW's Embassy Row, just off Dupont Circle and across from the Brookings Institution and the Carnegie Endowment for International Peace, and next to the Center for Global Development and the Peterson Institute. The school has hosted world leaders on a regular basis for public debate in international affairs.

An outdoor 2009 bust of Bernardo O'Higgins by Galvarino Ponce Morel is installed outside the Embassy of Chile in Washington, D.C., in the United States.

The Carnegie Endowment for International Peace (CEIP) is a nonpartisan international affairs think tank headquartered in Washington D.C. Founded in 1910 by Andrew Carnegie, the organization describes itself as being dedicated to advancing cooperation between nations and promoting active international engagement by the United States. In the University of Pennsylvania's "2019 Global Go To Think Tanks Report", Carnegie was ranked the number 1 top think tank in the world. In the 2015 Global Go To Think Tanks Report, Carnegie was ranked the third most influential think tank in the world, after the Brookings Institution and Chatham House. It was ranked as the top Independent Think Tank in 2018.Its headquarters building, prominently located on the Embassy Row section of Massachusetts Avenue, was completed in 1989 on a design by architecture firm Smith, Hinchman & Grylls. It has also hosted the embassy of Papua New Guinea in the U.S. The chairperson of Carnegie's board of trustees is former U.S. Secretary of Commerce Penny Pritzker, and the organization's president is Mariano-Florentino Cuéllar, who replaced former U.S. Deputy Secretary of State William J. Burns.

The Chilean ambassador in Washington, D.C. is the official representative of the Government in Santiago de Chile to the Government of the United States.

The Embassy of Chile in Washington, D.C. is the diplomatic mission of the Republic of Chile to the United States. It is located at 1732 Massachusetts Avenue, Northwest, Washington, D.C., in the Embassy Row neighborhood. The embassy has been located there since 1973. The embassy also operates Consulates-General in Miami, Los Angeles, San Francisco, Houston, Chicago, and New York City.The ambassador is Juan Gabriel Valdés. The ambassador's residence is located further northwest on Embassy Row, 2305 Massachusetts Avenue NW. Designed by architect Nathan C. Wyeth, the residence has belonged to the Republic of Chile since 1923.

The American Enterprise Institute for Public Policy Research, known simply as the American Enterprise Institute (AEI), is a center-right Washington, D.C.–based think tank that researches government, politics, economics, and social welfare. AEI is an independent nonprofit organization supported primarily by contributions from foundations, corporations, and individuals. Founded in 1938, AEI is commonly associated with conservatism and neoconservatism but does not support political candidates. AEI advocates in favor of private enterprise, limited government, and democratic capitalism.AEI is governed by a 28-member Board of Trustees, composed of executives and former executives from various corporations. Approximately 185 authors are associated with AEI. Arthur C. Brooks served as president of AEI from January 2009 through July 1, 2019. He was succeeded by Robert Doar.

McCormick Apartments, also known as Andrew Mellon Building, Mellon Apartment, or 1785 Massachusetts Avenue Northwest, is a landmark apartment building on Embassy Row in Washington, D.C., whose inhabitants once included Andrew W. Mellon. It is the home of the American Enterprise Institute.