Public holidays
1866, USA, District of Columbia
| # | Date | Public holiday |
|---|---|---|
| 1 | Monday, January 1, 1866 | New Year's Day |
| 2 | Monday, January 15, 1866 | Martin Luther King Day |
| 3 | Monday, February 19, 1866 | Washington's Birthday |
| 4 | Monday, April 16, 1866 | Patriots' Day/Emancipation Day |
| 5 | Monday, May 28, 1866 | Memorial Day |
| 6 | Tuesday, June 19, 1866 | Juneteenth National Independence Day |
| 7 | Wednesday, July 4, 1866 | Independence Day |
| 8 | Monday, September 3, 1866 | Labor Day |
| 9 | Monday, October 8, 1866 | Columbus Day |
| 10 | Sunday, November 11, 1866 | Veterans Day |
| Monday, November 12, 1866 | Veterans Day (observance) | |
| 11 | Thursday, November 22, 1866 | Thanksgiving |
| 12 | Tuesday, December 25, 1866 | Christmas |