Castalla is home to approximately 10,000 residents, with a population that has grown steadily in recent years due to its proximity to larger urban centers like Alicante. The population is primarily Spanish, but in recent years, the town has attracted a small but growing number of international residents, particularly from other European countries seeking a quiet, scenic place to live.
The town’s demographics skew towards middle-aged and older adults, although there is also a significant younger population, thanks to its family-friendly atmosphere and good schools. Castalla maintains a strong sense of community, with many local events and festivals reinforcing social ties.