Public holidays
1668, USA, Illinois
| # | Date | Public holiday |
|---|---|---|
| 1 | Sunday, January 1, 1668 | New Year's Day |
| Monday, January 2, 1668 | New Year's Day (observance) | |
| 2 | Sunday, February 12, 1668 | Lincoln's Birthday |
| Monday, February 13, 1668 | Lincoln's Birthday (observance) | |
| 3 | Wednesday, February 22, 1668 | Washington's Birthday |
| 4 | Wednesday, May 30, 1668 | Memorial Day |
| 5 | Wednesday, July 4, 1668 | Independence Day |
| 6 | Monday, September 3, 1668 | Labor Day |
| 7 | Tuesday, November 6, 1668 | Election Day |
| 8 | Tuesday, December 25, 1668 | Christmas |