Public holidays
1721, USA, South Dakota
| # | Date | Public holiday |
|---|---|---|
| 1 | Wednesday, 1 January 1721 | New Year's Day |
| 2 | Monday, 20 January 1721 | Martin Luther King Day |
| 3 | Monday, 17 February 1721 | Washington's Birthday |
| 4 | Monday, 26 May 1721 | Memorial Day |
| 5 | Friday, 4 July 1721 | Independence Day |
| 6 | Monday, 1 September 1721 | Labor Day |
| 7 | Tuesday, 11 November 1721 | Veterans Day |
| 8 | Thursday, 27 November 1721 | Thanksgiving |
| 9 | Thursday, 25 December 1721 | Christmas |