Is it ok to put a camma after Washington in Washington D.C.?

our teacher and I were arguing in college that it was wrong because putting a camma between Washinton D.C. like this Washington, D.C. would say that D.C. would be in the State of Washington and of course everyone knows its now since the cama signify's state and city.

Is it ok to put a camma after Washington in Washington D.C.?
You're right, it needs a comma. The correct punctuation is





Washington, D.C.
Reply:Not to be nasty,Anthony but isnt the word for (.) comma. maybe work on your spelling first before worring on the little things.
Reply:I have no idea what a camma is
Reply:it would be like saying it's washington city in the state of D.C....if you were looking at it that way. the reason people put a comma in between city and state in an address isn't because it's a city and a state, per say. it's simply to create a pause, a separation so you know the city name ends here , and the state name begins. you probably COULD put a comma there. it would be like saying Washington in the District of Columbia. i don't think you need one, though. there's only one washington D.C.