The Spain Barcelona Mission extends from Santander on the Bay of Biscay (on the Atlantic Ocean) to Valencia on the Mediterranean, and includes the islands of Mallorca, Menorca and Ibiza. Major cities include Barcelona, Bilbao, Burgos, Santander, San Sebastian, Pamplona, Girona, Tarragona, Valencia, Zaragoza, and Palma de Mallorca. It also includes the principality of Andorra in the Pyrenees. About 14 million people live within the boundaries of the mission.
The mission includes three distinct languages and two additional dialects: Spanish, Catalan (and its derivatives, Valenciano and Mallorquin), and Basque. However, Church services and missionary work are all conducted in Spanish.