Public holidays
1640, USA, Colorado
| # | Date | Public holiday |
|---|---|---|
| 1 | Sunday, 1 January 1640 | New Year's Day |
| Monday, 2 January 1640 | New Year's Day (observance) | |
| 2 | Monday, 16 January 1640 | Martin Luther King Day |
| 3 | Monday, 20 February 1640 | Washington's Birthday |
| Friday, 30 March 1640 | César Chávez Day (observance) | |
| 4 | Saturday, 31 March 1640 | César Chávez Day |
| 5 | Monday, 28 May 1640 | Memorial Day |
| 6 | Tuesday, 19 June 1640 | Juneteenth National Independence Day |
| 7 | Wednesday, 4 July 1640 | Independence Day |
| 8 | Monday, 3 September 1640 | Labor Day |
| 9 | Monday, 8 October 1640 | Columbus Day |
| 10 | Sunday, 11 November 1640 | Veterans Day |
| Monday, 12 November 1640 | Veterans Day (observance) | |
| 11 | Thursday, 22 November 1640 | Thanksgiving |
| 12 | Tuesday, 25 December 1640 | Christmas |