Monção is a municipality in the district of Viana do Castelo in Portugal. The population in 2011 was 19,230, in an area of 211.31 km². The curren…Monção is a municipality in the district of Viana do Castelo in Portugal. The population in 2011 was 19,230, in an area of 211.31 km². The current mayor is the Social Democrat António Barbosa. The municipal holiday is March 12.