Public holidays
1840, Brasil, Piauí
| # | Date | Public holiday |
|---|---|---|
| 1 | Wednesday, 1 January 1840 | Confraternização Universal |
| 2 | Tuesday, 3 March 1840 | Terça-feira de Carnaval |
| 3 | Friday, 17 April 1840 | Sexta Feira Santa ou Paixão de Cristo |
| 4 | Tuesday, 21 April 1840 | Tiradentes |
| 5 | Friday, 1 May 1840 | Dia do Trabalho |
| 6 | Thursday, 18 June 1840 | Corpus Christi |
| 7 | Monday, 7 September 1840 | Independência do Brasil |
| 8 | Monday, 12 October 1840 | Nossa Senhora Aparecida |
| 9 | Monday, 19 October 1840 | Dia do Piauí |
| 10 | Monday, 2 November 1840 | Finados |
| 11 | Sunday, 15 November 1840 | Proclamação da República Brasileira |
| 12 | Friday, 25 December 1840 | Natal |