Nowadays, parking space shortages and traffic congestion are two issues that all drivers are facing in large cities around the world. Due to the growing number of vehicles and the mismanagement of available parking spaces, heavy traffic in crowded cities are severe. Therefore, there is a compelling urge for an intelligent and efficient car parking system which can be used for managing the limited parking spaces, thereby saving on time, cost, and fuel. In this paper, a secure and reliable cloud-based intelligent car parking system based on Internet-of-Things (IoT) technology for smart cities is presented. Integrated on-site data collection using wireless sensors along with real-time and streaming data analytics on data from IoT are investigated to dynamically check the availability of parking spaces in different parking areas and address the above-mentioned challenges.