Arrigorriaga is home to around 12,000 residents, with a population that reflects the broader demographics of the Basque Country. The town is primarily composed of local Basque families, though in recent years, it has attracted people from other parts of Spain and Europe. The population has a balanced mix of age groups, with a strong sense of community among both the younger and older generations.
The town is known for its close-knit atmosphere, where local traditions and modern influences coexist harmoniously. Demographically, Arrigorriaga continues to grow, driven by its appeal as a peaceful yet conveniently located town near Bilbao.