The swift urban growth and rising population density in cities across the globe demand innovative strategies for effective infrastructure management. Cloud-based platforms utilizing the Internet of Things (IoT) have surfaced as a groundbreaking solution to tackle the challenges associated with smart city infrastructure. This paper examines the fusion of IoT technologies with cloud computing to improve the management of urban infrastructure, covering areas such as transportation, utilities, waste management, and public safety. By utilizing real-time data gathering, processing, and analytics, these platforms promote informed decision-making, enhance resource allocation, and boost service delivery. The research showcases various case studies that illustrate the successful adoption of IoT cloud-based solutions within smart cities, along with the challenges and future avenues for research and development in this field. In conclusion, the results emphasize the capability of IoT cloud-based platforms to foster sustainable, efficient, and resilient urban environments.