Public holidays
1680, USA, South Dakota
| # | Date | Public holiday |
|---|---|---|
| 1 | Monday, January 1, 1680 | New Year's Day |
| 2 | Monday, January 15, 1680 | Martin Luther King Day |
| 3 | Monday, February 19, 1680 | Washington's Birthday |
| 4 | Monday, May 27, 1680 | Memorial Day |
| 5 | Thursday, July 4, 1680 | Independence Day |
| 6 | Monday, September 2, 1680 | Labor Day |
| 7 | Monday, November 11, 1680 | Veterans Day |
| 8 | Thursday, November 28, 1680 | Thanksgiving |
| 9 | Wednesday, December 25, 1680 | Christmas |