Oeiras e São Julião da Barra, Paço de Arcos e Caxias is a civil parish in the municipality of Oeiras, Portugal. It was formed in 2013 by the merger of the former parishes Oeiras e São Julião da Barra, Paço de Arcos and Caxias. The population in 2011 was 33 827,Instituto Nacional de Estatística (INE), Census 2011 results according to the 2013 administrative division of Portugal in an area of 6.5 km².
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