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