O Porriño is a municipality in Spain, in the province of Pontevedra, in Galicia. On 1 January 2025 it had 20,965 inhabitants according to the INE municipal register (padrón), over an area of about 60.5 km².
Density, at about 347 inhabitants per km², is that of a populous urban area, with residential districts, services and businesses. Of the 36 municipalities in the province of Pontevedra with at least 5,000 inhabitants, it is number 8 by population.
As the crow flies it lies about 34 km south of Pontevedra, the provincial capital. The nearest major city is A Coruña, about 140 km away.
Nearby, within a few dozen kilometres, are other destinations featured in our guides: Vigo (14 km), Pontevedra (33 km).
To explore the area, use the map of neighbouring municipalities and the accommodation options in and around O Porriño; all the municipalities in the province of Pontevedra are listed on their own page.