Public holidays
1231, USA, Iowa
| # | Date | Public holiday |
|---|---|---|
| 1 | Wednesday, 1 January 1231 | New Year's Day |
| 2 | Monday, 20 January 1231 | Martin Luther King Day |
| 3 | Wednesday, 12 February 1231 | Lincoln's Birthday |
| 4 | Monday, 26 May 1231 | Memorial Day |
| 5 | Thursday, 19 June 1231 | Juneteenth National Independence Day |
| 6 | Friday, 4 July 1231 | Independence Day |
| 7 | Monday, 1 September 1231 | Labor Day |
| 8 | Tuesday, 11 November 1231 | Veterans Day |
| 9 | Thursday, 27 November 1231 | Thanksgiving |
| 10 | Friday, 28 November 1231 | Black Friday |
| 11 | Thursday, 25 December 1231 | Christmas |