Barreiro, in the Lisbon area, is part of Setúbal district. The municipality covers 31.8 km² and had 78,362 inhabitants at the 2021 census.
With about 2,464 inhabitants per km², it is one of the most densely populated areas in the country, part of a large metropolitan area. Of the 13 municipalities in Setúbal district, it is number 4 by population.
As the crow flies it lies about 18 km north-west of Setúbal, the capital.
Nearby, within a few dozen kilometres, are other destinations featured in our guides: Almada and Costa da Caparica (11 km), Lisbon (13 km), Palmela (15 km), Setúbal (18 km), Sesimbra (22 km).
To explore the area, use the map of neighbouring municipalities and the accommodation options in and around Barreiro; all the municipalities in Setúbal district are listed on their own page.