Smart cities are city concepts that aim to optimize the infrastructure, quality, and services of cities’ life of cities using communication and information technologies and the IoTs (Internet of Things). Smart cities aim to create more sustainable, efficient, and livable cities by integrating technology in the fields named as energy, transportation, water management, public services, and security. Smart cities will continue to be one of the cornerstones of urbanization in the future, in line with the aims of enhancing sustainability, efficiency, and quality of life. International Institute for Management Development (IMD) provides the index of smart city at each year. The IMD Smart City Index (SCI) evaluates citizens’ opinions about the structure and technology applications. The final score for each city is calculated employing the perceptions of the previous 3 years, with the weight of 3:2:1. The objective of this study is to provide an alternative performance=ranking method for smart cities. Data envelopment analysis (DEA) technique is used and the performance score of each country is determined considering structure and technology pillars and the results are analyzed.