
Which is money manufacturing unit is situated in Washington DC
The structure of the central banking system in the U.S. is unique in the world, in that an entity outside the central bank creates the currency. This other entity is the US Department of Treasury.
It is through the Bureau of Engraving and Printing and the United States Mint that the Treasury prints and mints all paper currency and coins in circulation in the US. The Department also collects all Federal taxes through the Internal Revenue Service and manages US government debt instruments.
http://www.ustreas.gov/

