I have just returned home after a trip to Washington DC. My level of ignorance about Washington DC prior to my trip is embarasing. However I did learn some things there.
There is a state called Washington that is nothing to do with Washington DC (it's on the other side of the country).
Washinton DC is in the district of columbia (the DC part). The DC is not part of any of the US states and exists outside of the states entirely.
Residence of Washington DC have none of the political representation that residence of the various states in the US have (no senators, congressmen etc etc).
I have to say this struck me as a bizzare anomoly. For a country founded on the cry 'no taxation without representation'to have such blatant taxation without representation in the very heart of it's political system seems to me bizzare.