The proper noun is spelled Washington (e.g. George Washington, Washington state, Washington, DC).
Washington DC is the name of a place, which means it is a proper noun.Proper nouns are the names of specific people (George Washington, Marie Antoinette), the names of specific places (Washington DC, Japan), or specific things (Oreo, Toyota Prius).
So America could have a proper capital city.
Washington STATE or Washington, DC? Sorry, had to ask.
Bus
Examples of common nouns for the proper noun 'Washington, DC' are:cityplacecapitalmetropolislocation
Washington DC is 428 miles east of Indianapolis, Indiana.
Washington, DC
Yes. Write to: The White House 1600 Pennsylvania Avenue NW Washington, DC 20500
Washington DC
Because the designer designed it that way. Simple as that.
Williamsburg is about half way there.