It's the capital of Spain's Vizcaya province
In 1602 Bilbao was made the capital of Biscay, a title previously held by ..... 
Bank of Bilbao) in 1907, and Caja de Ahorros Provincial de Vizcaya (Provincial... [DOC] [TLE] Guide to Vizcaya, Spain - Euroresidentes [PAR] Vizcaya has a population of 1,136,000 inhabitants and the capital city is Bilbao.