>>13168805 , >>13168822
No, it is not at all "odd." I just looked at the 1990 edition of the "Rand McNally Deluxe Motor Carriers' Road Atlas" and it shows that place near Annapolis as simply "Washington" ... no "D.C." no "District of Columbia".
So, more than 30 years old usage ...
And WHY are you guys whining over the captcha? 8 characters too much for you?