washignton dc
No, but rather the United States Constitution. But even then, "Washington, D.C." is not specifically named, just that the future (at the time) capital of the United States has to be held in a District separate from the states.
the answer is Baghdad
Frankfort
Topeka
Oslo
Denver
Washington D.C
Guatemala City
Capital: Hanoi
San Juan.
Kathmandu is Capital of Nepal.
Charleston