Ermesinde is a civil parish in the municipality of Valongo, in continental Portugal, 9 kilometres northeast of Porto. The population in 2011 wa…Ermesinde is a civil parish in the municipality of Valongo, in continental Portugal, 9 kilometres northeast of Porto. The population in 2011 was 38940, in an area of 7.65 km. It is the smallest by area, and the densest by population.