Bilbao's 2025 population is now estimated at 346,746. In 1950, the population of Bilbao was 227,488. Bilbao experienced a decrease of -1 residents over the past year, marking an annual decline of 0%. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects . These estimates represent the Urban agglomeration of Bilbao, which typically includes Bilbao's population in addition to adjacent suburban areas.