Mazarrón has a population of approximately 30,000 people, though this number can swell during the summer months when tourists flock to the beaches. The town has a diverse demographic, with a mix of local Spaniards and a growing number of international residents, particularly retirees from the UK and other European countries who have settled in the area.
The local population is predominantly Spanish-speaking, but English is widely understood, especially in the tourist areas and expatriate communities. Mazarrón has seen steady population growth in recent years, thanks to its attractive lifestyle and appealing climate, drawing both tourists and new residents.