What Is The Capital Of Washington DC?

No, the capital of Washington STATE is Olympia, not Washington, D.C.
D.C. is the capital of the entire United States -- and is 3,000 miles from Olympia, Washington.
D.C. does not have its own state capital because it is, in fact, not even an official state, just a "district." In this regard, it is like the Vatican, a sovereign nation contained within Rome.
D.C. is contained entirely within the state of Virginia, which is the upper-most state of what is considered the U.S. South.
Like all Southern big cities, D.C. is quite humid, and it is dogged by a high crime rate and a higher infant mortality rate than many Third World countries.
Still, it has a certain"Old South charm," and is home to some of the most notable museums in the U.S., specifically the Smithsonian Institute's many branches on "The Mall."
D.C. is also the location of 1600 Pennsylvania Avenue, the official residence of the president; the edifices of the major branches of government and federal departments; Lincoln Center for the Performing Arts; the Washington and Lincoln monuments; and the Ford Theater, where Lincoln was assassinated.

Washington DC is the capital of USA - it doesn't have it's own capital.

It is olympia

The capital of Washington D.C. is Olympia. Washington, D.C. basically is a capital city itself of United States of America and "D.C" is a short form for the District of Columbia.

Washington basically is the north-western state of the contiguous United States. There are a total of three national parks in Washington, Mount Rainer National Park, North Cascades National Park and the Olympic National Park. The climate of Washington differs significantly from the west to east. Some of the key factors which determine the climate of Washington are the great semi-permanent high pressure and low pressure classifications of the North Pacific Ocean.

The total population of this city was said to be 582,049, as of 2005, having an average population density of 3,481 per square kilometre.