Public holidays
1644, USA, Missouri
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1644 | New Year's Day |
| 2 | Friday, 12 February 1644 | Lincoln's Birthday |
| 3 | Monday, 22 February 1644 | Washington's Birthday |
| 4 | Sunday, 8 May 1644 | Truman Day |
| Monday, 9 May 1644 | Truman Day (observance) | |
| 5 | Monday, 30 May 1644 | Memorial Day |
| 6 | Monday, 4 July 1644 | Independence Day |
| 7 | Monday, 5 September 1644 | Labor Day |
| 8 | Sunday, 25 December 1644 | Christmas |
| Monday, 26 December 1644 | Christmas (observance) |