Public holidays
1980, USA, South Dakota
| # | Date | Public holiday |
|---|---|---|
| 1 | Tuesday, 1 January 1980 | New Year's Day |
| 2 | Monday, 21 January 1980 | Martin Luther King Day |
| 3 | Monday, 18 February 1980 | Washington's Birthday |
| 4 | Monday, 26 May 1980 | Memorial Day |
| 5 | Friday, 4 July 1980 | Independence Day |
| 6 | Monday, 1 September 1980 | Labor Day |
| 7 | Tuesday, 11 November 1980 | Veterans Day |
| 8 | Thursday, 27 November 1980 | Thanksgiving |
| 9 | Thursday, 25 December 1980 | Christmas |