2 Answers

Washington D.C. is not a state but a federal district which was hived from the states of Virginia and Maryland in 1790. As such, it has no voting representation in the Senate. While it is not a state, it still has state organs such as the State Board of Education and the State Board of Elections. The District of Columbia occupies an area of 68 square miles and is home to over half a million people. The high population translates to an equally-high population density of over 11,300 persons per square mile. However, the population balloons in the daytime as people residing in the neighbouring states of Virginia and Maryland commute to Washington to work. As the nation’s capital, D.C. is home to a large number of government offices which include the White House and the US Capitol.

More info here>>https://www.worldatlas.com/articles/which-state-is-washington-d-c-in.html