Callosa de Segura has a population of approximately 17,000 people, with a mix of locals and expatriates from various European countries. The city has seen steady population growth over the years, driven by both local development and the attraction of foreign residents seeking a quieter lifestyle within close proximity to larger urban areas.
The majority of the population is Spanish, but there is a growing presence of British, German, and other European expatriates, particularly those who have chosen to retire in this pleasant Mediterranean setting. This diversity has led to a multicultural atmosphere that enriches the local community.