As one of the smart city domains, the smart government becomes a vast area to study. Research in developing new ideas in technology, new ideas relating to the smart government with policy, environment, society are a few implementations of the smart government concept. The smart government's application has different specifications to solve each study's problem. The study aims to understand the implementation of smart government areas. It brings a review of the application of smart government from many previous studies using the PRISMA protocol. The systematic review result found 18 final articles to specify and elaborate on the smart government's implementation areas. The implementations and issues are divided into six areas: data analysis, operation, planning, collaboration, assessment, and energy management. The most recent topic in smart government studies is analyzing data and getting citizen engagement, using data mining techniques from social media and government websites to understand the citizens' needs and problems in the city.