Castellón de la Plana has a population of approximately 170,000 residents, making it a mid-sized city by Spanish standards. The city has experienced steady growth in recent years, partly due to its strong economy and its appeal as a destination for both tourists and expatriates. The population is diverse, with a mix of locals, people from other parts of Spain, and immigrants from various countries, particularly from Latin America, Africa, and Eastern Europe.
The city’s demographics are largely reflective of its Mediterranean location, with a majority of residents identifying as Valencian or Spanish. The local language, Valencian, is widely spoken alongside Spanish, adding to the city’s cultural richness. Castellón is also home to a growing community of international students and professionals, thanks to the presence of the Universitat Jaume I, which contributes to the city’s youthful and vibrant atmosphere.