Public holidays
1880, USA, South Dakota
| # | Date | Public holiday |
|---|---|---|
| 1 | Thursday, 1 January 1880 | New Year's Day |
| 2 | Monday, 19 January 1880 | Martin Luther King Day |
| Monday, 16 February 1880 | Washington's Birthday/Susan B. Anthony Day (observance) | |
| 3 | Monday, 31 May 1880 | Memorial Day |
| 4 | Sunday, 4 July 1880 | Independence Day |
| Monday, 5 July 1880 | Independence Day (observance) | |
| 5 | Monday, 6 September 1880 | Labor Day |
| 6 | Thursday, 11 November 1880 | Veterans Day |
| 7 | Thursday, 25 November 1880 | Thanksgiving |
| Friday, 24 December 1880 | Christmas (observance)/Christmas Eve | |
| 8 | Saturday, 25 December 1880 | Christmas |
| Friday, 31 December 1880 | New Year's Day (observance) |