Public holidays
1678, USA, South Dakota
| # | Date | Public holiday |
|---|---|---|
| 1 | Saturday, January 1, 1678 | New Year's Day |
| 2 | Monday, January 17, 1678 | Martin Luther King Day |
| 3 | Monday, February 21, 1678 | Washington's Birthday |
| 4 | Monday, May 30, 1678 | Memorial Day |
| 5 | Monday, July 4, 1678 | Independence Day |
| 6 | Monday, September 5, 1678 | Labor Day |
| 7 | Friday, November 11, 1678 | Veterans Day |
| 8 | Thursday, November 24, 1678 | Thanksgiving |
| 9 | Sunday, December 25, 1678 | Christmas |
| Monday, December 26, 1678 | Christmas (observance) |