St. Nicholas Cathedral (Washington, D.C.)

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.

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 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 Babcock–Macomb House is a historical residence located at 3415 Massachusetts Avenue, NW, Washington, D.C. Construction of the house was ordered by Kate Woodman Babcock, widow of former Representative Joseph W. Babcock of Wisconsin. Babcock had had a successful career in the lumber industry while serving two terms in the Wisconsin State Assembly. Upon taking office in the House of Representatives in 1893, Babcock was appointed to the Committee on the District of Columbia. In 1894 he was appointed as chairman. In this position, Babcock gained local popularity and substantial wealth, due to the committee's role in development of the city. Constance McLaughlin Green wrote that Babcock "cleared $400,000 in Washington real estate ... simply by using [his] advance knowledge of which sections of the city were to get funds..."In 1911, Babcock's widow Kate purchased two lots in the newly laid out Massachusetts Heights subdivision, established when Massachusetts Avenue was extended beyond Florida Avenue. Mrs. Babcock purchased the two lots for $14,529 on October 18. The home was the first constructed in the neighborhood, which the city's planning committee hoped would attract the wealthy elite.The architect was Arthur B. Heaton. Heaton opened his own office in Washington in 1900 at age 25. Between 1899 and 1906 he designed houses for the new Cleveland Park neighborhood. From 1908 to 1920 he served as supervising architect for the Washington National Cathedral. During this period, Heaton and his family lived in Cleveland Park, and he designed many buildings for the neighborhood. His residential designs used numerous styles, including Georgian, Colonial Revival, Spanish mission, and the Neo-Renaissance of the Babcock–Macomb House.Mrs. Babcock never moved into the new home. In 1917 she sold it to Tucker Sands, a vice president of the National Metropolitan Bank. Sands rented the house to tenants for two years, until he sold it in 1919 to Army Colonel Augustus Canfield Macomb. The Macomb family lived in the home until 1982, when Edna Wilson Macomb, widow of Alexander Macomb, sold the property to the Republic of Cape Verde, which has utilized it as their embassy to the United States.

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.

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.

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.

Saint Sophia Greek Orthodox Cathedral was founded as a church in 1904 to serve the Greek Orthodox residents of the District of Columbia. In 1962, the church was elevated to a cathedral under the jurisdiction of the Archbishop of America in New York City and serves as his cathedral in Washington. The church is not named for Saint Sophia the martyr, but rather the Holy Wisdom of God in the tradition of Hagia Sophia of Constantinople. The building is in the Neo-Byzantine style with a central dome that reaches 80 ft (24 m) in height. The congregation met in temporary quarters for several years, prior to the construction of its own church near 8th and L Streets NW which was dedicated in 1924. This site is currently occupied by the Walter E. Washington Convention Center. Construction on the current edifice at 2815 36th Street NW, near Massachusetts Avenue and a short distance from the Washington National Cathedral, began in 1951. The congregation began worshipping there in 1955 shortly after major construction was completed. Although the building has been in use for over fifty years, the interior decoration is incomplete. Work began on the interior in 1965 and continues to the present. The cathedral was Consecrated in May 2015 by Archbishop Demetrios of America. In 2003, construction began on an education center to the east of the sanctuary. It opened September 16, 2004, and contains classrooms, a library and ballroom to house gatherings. On May 10, the Cathedral was consecrated in a service presided over by Archbishop Demetrios of America, Primate of the Greek Orthodox Church in America; Bishop Andonios of Phasiane, Chancellor of the Greek Orthodox Archdiocese of America; the Reverend Steven Zorzos, Presiding Priest of Saint Sophia Cathedral; the Reverend Dimitrios Lee, Assistant Priest of Saint Sophia Cathedral; the Reverend John Tavlarides, Presiding Priest Emeritus of Saint Sophia Cathedral; and Archdeacon Panteleimon Papadopoulos. As part of the service, the relics of three saints were interred in the altar table—those of Saint Panteleimon, Saint Barbara and Saint Kyrikos (representing a male saint, a female saint and one of the few child saints).

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.