Public holidays
1643, USA, South Dakota
| # | Date | Public holiday |
|---|---|---|
| 1 | Thursday, January 1, 1643 | New Year's Day |
| 2 | Monday, January 19, 1643 | Martin Luther King Day |
| Monday, February 16, 1643 | Washington's Birthday/Susan B. Anthony Day (observance) | |
| 3 | Monday, May 25, 1643 | Memorial Day |
| Friday, July 3, 1643 | Independence Day (observance) | |
| 4 | Saturday, July 4, 1643 | Independence Day |
| 5 | Monday, September 7, 1643 | Labor Day |
| 6 | Wednesday, November 11, 1643 | Veterans Day |
| 7 | Thursday, November 26, 1643 | Thanksgiving |
| 8 | Friday, December 25, 1643 | Christmas |