Oleiros is a municipality in the district of Castelo Branco in Portugal. The population in 2011 was 5,721, in an area of 471.09 km. The present …Oleiros is a municipality in the district of Castelo Branco in Portugal. The population in 2011 was 5,721, in an area of 471.09 km. The present mayor is José Santos Marques, elected by the Social Democratic Party. The municipal holiday is the Monday after the 2nd Sunday of August.