Public holidays
1666, USA, Wisconsin
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1666 | New Year's Day |
| 2 | Monday, 18 January 1666 | Martin Luther King Day |
| 3 | Monday, 15 February 1666 | Washington's Birthday/Susan B. Anthony Day |
| 4 | Monday, 31 May 1666 | Memorial Day |
| Friday, 18 June 1666 | Juneteenth (observance) | |
| 5 | Saturday, 19 June 1666 | Juneteenth National Independence Day |
| 6 | Sunday, 4 July 1666 | Independence Day |
| Monday, 5 July 1666 | Independence Day (observance) | |
| 7 | Monday, 6 September 1666 | Labor Day |
| 8 | Monday, 11 October 1666 | Columbus Day |
| 9 | Tuesday, 2 November 1666 | Election Day |
| 10 | Thursday, 25 November 1666 | Thanksgiving |
| Friday, 24 December 1666 | Christmas (observance)/Christmas Eve | |
| 11 | Saturday, 25 December 1666 | Christmas |
| Friday, 31 December 1666 | New Year's Day (observance) |