Public holidays
1664, Portugal, Feriados Nacionais
| # | Date | Public holiday |
|---|---|---|
| 1 | Tuesday, 1 January 1664 | Ano Novo |
| 2 | Friday, 11 April 1664 | Sexta-Feira Santa |
| 3 | Friday, 25 April 1664 | Dia da Liberdade |
| 4 | Thursday, 1 May 1664 | Dia do Trabalhador |
| 5 | Tuesday, 10 June 1664 | Dia de Portugal |
| 6 | Thursday, 12 June 1664 | Corpo de Deus |
| 7 | Friday, 15 August 1664 | Assunção |
| 8 | Sunday, 5 October 1664 | Implantação República |
| 9 | Saturday, 1 November 1664 | Todos os Santos |
| 10 | Monday, 1 December 1664 | Independência |
| 11 | Monday, 8 December 1664 | Imaculada Conceição |
| 12 | Thursday, 25 December 1664 | Natal |