Sestao has a population of around 27,000 residents, making it a small but vibrant community within the Greater Bilbao metropolitan area. The city has a diverse demographic makeup, reflecting its industrial past, when it attracted workers from various regions of Spain and beyond. Today, the population consists primarily of Basque and Spanish residents, with a growing number of immigrants contributing to the city’s cultural diversity.
The age distribution in Sestao is relatively balanced, with a mix of young families, working-age adults, and elderly residents. The city has been focusing on urban renewal projects to attract younger professionals and families, helping to revitalize its demographic profile.