Public holidays
1866, Brasil, Maranhão
| # | Date | Public holiday |
|---|---|---|
| 1 | Monday, 1 January 1866 | New Year's Day |
| 2 | Tuesday, 13 February 1866 | Carnival Tuesday |
| 3 | Friday, 30 March 1866 | Good Friday |
| 4 | Saturday, 21 April 1866 | Tiradentes Day |
| 5 | Tuesday, 1 May 1866 | Labour Day |
| 6 | Thursday, 31 May 1866 | Corpus Christi |
| 7 | Saturday, 28 July 1866 | Maranhão's Accession to Brazilian Independence |
| 8 | Friday, 7 September 1866 | Independence Day |
| 9 | Friday, 12 October 1866 | Our Lady of Aparecida |
| 10 | Friday, 2 November 1866 | All Souls' Day |
| 11 | Thursday, 15 November 1866 | Republic Proclamation Day |
| 12 | Saturday, 8 December 1866 | Immaculate Conception |
| 13 | Tuesday, 25 December 1866 | Christmas Day |