Monte Carlo, city, Monaco, on the Mediterranean Sea, adjacent to the city of Monaco. Famous for its gambling casino, Monte Carlo is one of Europe's leading tourist resorts. Within the casino is the Opéra de Monte Carlo, an opera and ballet house and the headquarters of Les Ballets de Monte Carlo. In 1861 a 50-year concession to operate the gaming rooms was granted to a private individual. Since 1898 the concession has been operated by the Société des Bains de Mer, a private company, in which the government now holds a majority interest. This corporation also owns the principal hotels and clubs of the commune that serve the tourist trade. The citizens of Monaco are exempt from taxes, and they are forbidden to enter the gaming rooms. Population (1982) 13,154.