As a result of rapid urbanization, development of transportation, tourism and service sectors, and increase in population, many environmental problems have threatened the coastal areas and their surroundings. Human activities in the coastal zone are damaging the integrity of the coastal resource system. To prevent this, first of all, conflicts of interest between short-term economic benefits and long term ecological assets should be identified and solved by means of integrated coastal management. In this paper, planning and management problems of coastal city municipalities were discussed in the case of Yalova. The natural environment of research area is potentially a high quality area with regard to its seaside, hills and forests with warm climate. But too many aspects of uncontrolled development with the ineffective management system in the area have led to its degradation. Local governments, especially municipalities, in the area are not effective and not efficient in performing their functions, because of limited financial resources, insufficient division of labor between local and central administration and people, administrative and legal problems (in laws and regulations, many actors and organizations are stated as responsible for functions concerning coastal management). In order to identify these kinds of problems of municipalities, questionnaires including various questions related with planning and management issues were applied for central and district municipalities of Yalova. The results were discussed within the integrated coastal management approach and finally some suggestions were offered to mitigate municipality's problems and to improve sustainable use of coastal resources.