List of Former United States Counties - District of Columbia

District of Columbia

• Alexandria County, D.C. (1791–1846) retroceded to Virginia becoming Alexandria County, Virginia.
• Washington County, D.C. Abolished in 1871 and consolidated with the District of Columbia. Under the current (2001, revised through 2005) District of Columbia Code, the entire District of Columbia is a single body corporate for municipal purposes; the code does not mention Washington County except to make the District of Columbia the successor in title to its property.

Georgetown City and Washington City are former county-equivalents. The District of Columbia comprised three county-equivalents when it was consolidated in 1871: Georgetown City, Washington City, and the Remainder of the District—as they are termed in the Ninth Census of the United States (1870). There had been four county-equivalents in the District prior to the retrocession of Alexandria to Virginia in 1846. In its retrospective decennial population counts the Ninth Census lists four for 1840 back to 1810, Alexandria and Washington counties alone for 1800, and none for 1790 prior to the creation of the district.