[2] The old Northern Liberty Market stood along Seventh Street until 1872, when it was demolished by Governor Alexander Shepherd in a night raid with two to 300 men.

[4] The roadways were removed in 1882 at the request of residents who complained that "in its former condition the constant passage of vehicles of all descriptions through the park made it unpleasant and oftentimes dangerous for those frequenting it.

[9] In 2008, a sculpture was installed on the lawn at the south side of the square - "The Hand" created by Jim Fauntleroy in the 1960s for the Southern Christian Leadership Conference’s Poor People’s Campaign.

[2] In the 1980s, 7th Street was shut down for several years during the construction of the Green Line (Washington Metro) - the Mount Vernon Square station opened in 1991.

[14] The boundaries of the neighborhood are;[15][16] In 1977, the city used eminent domain to purchase several blocks southwest of Mount Vernon Square.

[19] In 1998, construction began on a new larger convention center, occupying several blocks directly north of Mount Vernon Square.

[25] On the west side of the square is the 901 New York Avenue office building (headquarters of law firm Finnegan, Henderson, Farabow, Garrett & Dunner), completed in 2003.

[31] The lot at the southwest corner of the square was the former site of the old Washington Convention Center, now the CityCenterDC development, which opened in 2015.