Babcock–Macomb House

The Cape Verdean ambassador in Washington, D. C. is the official representative of the Government in Praia to the Government of the United States.

The Embassy of Cape Verde in Washington, D.C. is the diplomatic mission of the Republic of Cape Verde to the United States. It is located at 3415 Massachusetts Avenue, Northwest, Washington, D.C., in the Embassy Row neighborhood.The Ambassador is Dr Carlos Wahnon Veiga.

The Heurich-Parks House at 3400 Massachusetts Avenue on Observatory Circle, Washington, D.C. was built in 1925 by philanthropic businessman Christian Heurich, Jr. The home was sold to ophthalmologist Marshall M. Parks in 1960. On October 13, 2015, the house was listed on the National Register of Historic Places.

The Embassy of Iraq in Washington, D.C. is the diplomatic mission of the Republic of Iraq to the United States. The embassy is located at 3421 Massachusetts Avenue, Northwest, in the Embassy Row neighborhood, near the United States Naval Observatory.

St. Nicholas Cathedral (Russian: Свято-Николаевский собор) in Washington, D.C., is the primatial cathedral of the Orthodox Church in America and the seat of Tikhon, Archbishop of Washington, Metropolitan of All America and Canada of the Orthodox Church in America.

The Embassy of Nepal in Washington, D.C. is the Federal Democratic Republic of Nepal's diplomatic mission to the United States. It is located at 2730 34th Place NW Washington, D.C., in the Glover Park neighborhood. The Ambassador is Sridhar Khatri.

The Norwegian ambassador to the United States is the official representative of the Government of Norway to the Government of the United States.

The Embassy of Azerbaijan in Washington, D.C. is the diplomatic mission of the Republic of Azerbaijan to the United States. It is located on Embassy Row at 2741 34th Street, NW, NW Washington, DC. The embassy opened on March 6, 1992, after dissolution of Soviet Union in late December 1991. The United States opened U.S. Embassy in Baku, Azerbaijan on March 16, 1992.The chancery is housed in a 1949 building, with a current estimated value of $3,417,500 purchased by Azerbaijani government on March 22, 2000, for $1,595,000. The building is in the District of Columbia Public School District.

The Apostolic Nunciature to the United States is the diplomatic mission of the Holy See to the United States. It is located at 3339 Massachusetts Avenue Northwest, Washington, D.C., in the Embassy Row neighborhood. Since 2016 the Papal nuncio has been Archbishop Christophe Pierre. The Apostolic Nunciature to the United States is an ecclesiastical office of the Catholic Church in the United States, with the rank of an embassy. The nuncio serves both as the ambassador of the Holy See to the government of the United States and as delegate and point-of-contact between the Catholic hierarchy in America and the pope. The Apostolic Nunciature is an administrative center of the Catholic Church in the United States. Communications from the United States Conference of Catholic Bishops and the various dioceses in the United States to the Holy See pass through the nunciature. The nuncio also fills a central role in the appointment of bishops in the U.S. and is the official responsible for announcing such appointments. The physical building which houses the offices of the apostolic nuncio and his staff is also called the Nunciature to the United States of America. It is exempt from the jurisdiction of the Archdiocese of Washington (canon 366 1°).

The Finnish Embassy in Washington, D.C. is Finland's embassy to the United States. It is located at 3301 Massachusetts Avenue, in the Embassy Row neighborhood.The embassy also operates consulates-general in Los Angeles and New York. The modernist structure was designed by Heikkinen – Komonen Architects and opened in 1994. The Embassy became the first green embassy in the United States, receiving LEED Gold Certification in 2010.The Diplomatic Finnish Sauna Society meets at the embassy.

Massachusetts Heights is a small neighborhood in Northwest Washington, DC, dominated by the grounds of the Washington National Cathedral. The neighborhood is bounded to the north by Woodley Road, to the southwest by Massachusetts Avenue, to the east by 34th Street NW, and to the west by Wisconsin Avenue. The only residential section of Massachusetts Heights is a small triangular wedge between Massachusetts Avenue and Garfield Street, just adjacent to Observatory Circle and the grounds of the Vice President's Residence. The remainder of the neighborhood is entirely occupied by the Cathedral and its affiliated properties, including St. Albans School, National Cathedral School, and the Beauvoir School.

Number One Observatory Circle is the official residence of the vice president of the United States. Located on the northeast grounds of the U.S. Naval Observatory in Washington, D.C., the house was built in 1893 for the observatory superintendent. The chief of naval operations (CNO) liked the house so much that in 1923 he took over the house for himself. It remained the residence of the CNO until 1974, when Congress authorized its transformation to an official residence for the vice president, though a temporary one. It is still the "official temporary residence of the vice president of the United States" by law. The 1974 congressional authorization covered the cost of refurbishment and furnishing the house. Although Number One Observatory Circle was made available to the vice president in 1974, more than three years passed before a vice president lived full-time in the house. Vice President Gerald Ford became president before he could use the house. His vice president, Nelson Rockefeller, primarily used the home for entertainment as he already had a well-secured residence in Washington, D.C., though the Rockefellers donated millions of dollars' worth of furnishings to the house. Vice President Walter Mondale was the first vice president to move into the house. Every vice president since has lived there.The vice-presidential mansion was refurbished by the United States Navy in early 2001, slightly delaying the move of Vice President Dick Cheney and his family. Similarly, Vice President Kamala Harris delayed moving in until April 2021 while renovations occurred.