The Internet of Things (IoT), is a network of interrelated devices that connect and exchange data with other IoT devices and the cloud. IoT devices are typically embedded with technology such as sensors and software, including mechanical and digital machines and consumer objects. One revolutionary method for creating scalable smart city solutions is the combination of cloud computing and IoT technology. This analysis examines how IoT cloud integration is critical in improving urban infrastructure and services, which raises citizens' quality of life. After introducing the core ideas of cloud computing and the IoT, we examine several architectures and frameworks that make effective data collecting, processing, and analysis possible. Real-time decision-making is made possible by these frameworks, essential for efficient urban management. Important case studies show how IoT cloud solutions have been successfully implemented in various industries, such as public safety, waste management, energy efficiency, and traffic management. These illustrations show how IoT cloud integration can improve service delivery in urban settings, lower operating costs, and allocate resources optimally. Significant obstacles to this integration are also covered in the report, including issues with data security, device interoperability, and the requirement for scalable infrastructure to handle expanding metropolitan populations. This study thoroughly overviews the possibilities of IoT cloud integration in promoting resilient and sustainable urban environments by combining recent research and real-world implementations. We stress that stakeholders must work together to overcome current obstacles and fully reap the rewards of smart city initiatives, including government organizations, businesses, and academic institutions. By focusing on the urgent need for creative IoT cloud solutions to handle the challenges of contemporary urbanization and improve the overall urban experience, this review adds to the continuing smart city development.