San Martín de Valdeiglesias has a population of around 8,000 residents, making it a small yet vibrant community. The population is diverse, with a mix of local families, expatriates, and seasonal residents who come to enjoy the town’s natural beauty. The town has seen moderate population growth in recent years, partly due to its appeal as a peaceful retreat close to Madrid.
Demographically, the town has a balanced age distribution, with a mix of young families, retirees, and working professionals. The presence of second homes and holiday rentals means that the population increases significantly during the summer months and holiday seasons.