This master's thesis aims to analyze the business models of county port authorities in the Republic of Croatia with the intention of understanding the key characteristics, financial aspects, operational functions, and perspectives of the development of port authorities. The goal of the establishment of the County Port Authorities is to manage the sea and land port area, that is, to deal with the management, use, maintenance, and construction of ports open to public traffic. Seaports serve as vital centers for the advancement and growth of an economy, acting as a conduit for global trade. They represent the lifeblood of a country, facilitating its integration into the global market. The implementation of an effective management model for seaports is crucial for ensuring quality and efficient operations. To develop seaports, substantial investments in infrastructure and superstructure are essential. By analyzing the financial data of the county port authorities of the Primorje-Gorski Kotar County and comparing them with state port authorities and county port authorities in the territory of other counties, the differences and similarities of the management of the port area and the management model are highlighted, and potential guidelines for improving operations with the aim of a greater contribution to the development of local and regional levels are identified.