Presidents of the United States who took at least one oath of office outside of Washington DC
(By virtue of the writer massively screwing up this question, there are two answers, and only one is necessary).George Washington
John Adams
Chester Arthur
Lyndon B. Johnson
(edited at 9:18 pm, July 2, 2016 (PDT))Original question:
Presidents of the United States who took at least one oath of office outside of Washington DC
George Washington
John Adams
Chester Arthur
Lyndon B. Johnson
Calvin Coolidge (sworn in by his father in Plymouth, VT) and Theodore Roosvelt (sworn in, in Buffalo, NY) (edited at 9:18 pm, July 2, 2016 (PDT))
Original Answer: Calvin Coolidge (sworn in by his father in Plymouth, VT)