Oeiras is a municipality in western part of the Lisbon Metropolitan Area, subregion of Greater Lisbon, in continental Portugal. It is part of the urban agglomeration of Lisbon. The population in 2011 was 172,120, in an area of 45.88 km², making the municipality the fifth-most densely populated in Portugal. Oeiras is an important economic hub, being one of the most highly developed municipalities of Portugal and Europe. It has the highest GDP in the country, being also the second municipality with the highest purchasing power as well as the second one collecting taxes in the country. This economic results are also a reflection of the inhabitants studies, being Oeiras the municipality with the highest concentration of population with higher education in the country and the lowest unemployment rate in the Lisbon area.