Public holidays
1990, Brasil, Piauí
| # | Date | Public holiday |
|---|---|---|
| 1 | Monday, 1 January 1990 | Confraternização Universal |
| 2 | Tuesday, 27 February 1990 | Terça-feira de Carnaval |
| 3 | Friday, 13 April 1990 | Sexta Feira Santa ou Paixão de Cristo |
| 4 | Saturday, 21 April 1990 | Tiradentes |
| 5 | Tuesday, 1 May 1990 | Dia do Trabalho |
| 6 | Thursday, 14 June 1990 | Corpus Christi |
| 7 | Friday, 7 September 1990 | Independência do Brasil |
| 8 | Friday, 12 October 1990 | Nossa Senhora Aparecida |
| 9 | Friday, 19 October 1990 | Dia do Piauí |
| 10 | Friday, 2 November 1990 | Finados |
| 11 | Thursday, 15 November 1990 | Proclamação da República Brasileira |
| 12 | Tuesday, 25 December 1990 | Natal |