The United States capital of Washington, District of Columbia (“D.C.”), has been nicknamed “Washington Demands Cash” since at least 1958. The joke, however, has only rarely been used.
   
Other “D.C.” nicknames include “District of Confusion” (since at least 1943), “District of Corruption” (since 1951), “Da Capital” (since at least 1979), “District of Criminals” (since at least 1992) and “District of Cunts” (since 2009).
   
   
Wikipedia: Washington, D.C.
Washington, D.C., formally the District of Columbia and commonly referred to as Washington, “the District”, or simply D.C., is the capital of the United States. The signing of the Residence Act on July 16, 1790, approved the creation of a capital district located along the Potomac River on the country’s East Coast. The U.S. Constitution provided for a federal district under the exclusive jurisdiction of the Congress and the District is therefore not a part of any U.S. state.
 
30 July 1958, The Daily Courier (Connellsville, PA), “Assignment America” by Phyllis Battelle, pg. 16, col. 2:
“Now I know what they mean by Washington, D.C.—Washington demands cash.” (45)
(A 45 out of 100 score means that this is an average joke.—ed.)
 
1 March 1973, Wellsboro (PA) Gazette, pg. 18, col. 1:
“Washington, D. C. means Washington Demands Cash.” (Jack Herbert)
 
Google News Archive
22 April 1973, Nevada (MO) Herald, pg. 1, col. 1:
QUOTE—Washington, D.C. means “Washington Demands Cash.” (Jack Herbert).
 
9 September 1982, Daily Republican Register (Mount Carmel, IL), “Now a proverb contest?” by Larry Reynolds, pg. 2, col. 1:
Let’s try politics: “After paying my taxes I know what Washington, D.C., stands for — ‘Washington Demands Cash’.”