From the Guide to 2010 State and Local Census Geography — District of Columbia — History:

“The area of the District of Columbia was part of the original territory of the United States. The District of Columbia was formed from territory ceded by Maryland and Virginia in 1788, and was established in accordance with Acts of Congress passed in 1790 and 1791. Its boundary, a square ten miles on a side with vertices at the cardinal points to resemble a diamond, was established on March 30, 1791, and included all of the territory within present-day Arlington County, Virginia, and part of Alexandria city, Virginia. The portion south of the Potomac River was retroceded to Virginia in 1846.

“Census data for the District of Columbia are available beginning with the 1800 census.”

From QuickFacts: statistics for all states and counties, and for cities and towns with a population of 5,000 or more.

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From data.census.gov:

Source: 2019 American Community Survey (ACS) 1-Year Estimates.

From Census Business Builder: Regional Analyst Edition - 3.3.0:

From the State Data Center (SDC) Program:

From Foreign Trade > U.S. International Trade Data:

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From the Newsroom > Stats for Stories (SFS):

From U.S. Census Bureau History (in order by publication date, newest to oldest):

From the Statistics in Schools (SIS) program: