Public holidays
1780, USA, Iowa
| # | Date | Public holiday |
|---|---|---|
| 1 | Saturday, 1 January 1780 | New Year's Day |
| Friday, 11 February 1780 | Lincoln's Birthday (observance) | |
| 2 | Saturday, 12 February 1780 | Lincoln's Birthday |
| 3 | Tuesday, 30 May 1780 | Memorial Day |
| 4 | Tuesday, 4 July 1780 | Independence Day |
| 5 | Monday, 4 September 1780 | Labor Day |
| 6 | Monday, 25 December 1780 | Christmas |