Statistics for occurrence #1 of “Washington, D. C.” in chapter 1 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 4: The Cavalry:

...designated by the State authorities Second Regiment Cavalry on November 18, 1861, but the designation was changed by the War Department to the Seventh New York Cavalry. The seven companies left for Washington, D. C. , November 23, 1861, and remained on duty there till the following March. The regiment was honorably discharged, and many of its members saw real service later. General I. N. Palmer, appears in th...
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