Maia is a municipality in the Porto Metropolitan Area, Grande Porto subregion, in Norte Region, Portugal. It is located 11 km north of cent…Maia is a municipality in the Porto Metropolitan Area, Grande Porto subregion, in Norte Region, Portugal. It is located 11 km north of central Porto. The population in 2011 was 135,306, in an area of 82.99 km². There is one city and three towns in the municipality.