Public holidays
1840, USA, Iowa
| # | Date | Public holiday |
|---|---|---|
| 1 | Wednesday, January 1, 1840 | New Year's Day |
| 2 | Wednesday, February 12, 1840 | Lincoln's Birthday |
| 3 | Saturday, May 30, 1840 | Memorial Day |
| Friday, July 3, 1840 | Independence Day (observance) | |
| 4 | Saturday, July 4, 1840 | Independence Day |
| 5 | Monday, September 7, 1840 | Labor Day |
| 6 | Friday, December 25, 1840 | Christmas |