This might prove helpful
List of the busiest airports in Spain - Wikipedia, the free encyclopedia
Apart from Corvera, Castellon and Ciudad Real, there were quite a few airports in Spain with a runway over 2,000 metres but few passengers in 2012
Huesca - 1,313 passengers
Cordoba - 9,835 passengers
Logrono - 19,263 passengers
Burgos - 21,057 passengers
Salamanca - 22,716 passengers
Leon - 50,835 passengers
As a comparison for those in the UK, Plymouth airport in 2010 managed 96,498 terminal (i.e. non-transit) passengers, before the airport closed in December 2011.