Public holidays
1866, USA, Delaware
| # | Date | Public holiday |
|---|---|---|
| 1 | Monday, 1 January 1866 | New Year's Day |
| 2 | Monday, 15 January 1866 | Martin Luther King Day |
| Friday, 30 March 1866 | César Chávez Day (observance)/Good Friday | |
| 3 | Monday, 28 May 1866 | Memorial Day |
| 4 | Tuesday, 19 June 1866 | Juneteenth National Independence Day |
| 5 | Wednesday, 4 July 1866 | Independence Day |
| 6 | Monday, 3 September 1866 | Labor Day |
| 7 | Sunday, 11 November 1866 | Veterans Day |
| Monday, 12 November 1866 | Veterans Day (observance) | |
| 8 | Thursday, 22 November 1866 | Thanksgiving |
| 9 | Friday, 23 November 1866 | Black Friday |
| 10 | Tuesday, 25 December 1866 | Christmas |