E-government-based population administration services are a strategic instrument in public service reform aimed at improving efficiency, transparency, and quality of service to the public. This research is motivated by the persistent problems encountered with conventional population administration services, which tend to be slow, unresponsive, and do not fully meet the principles of modern public service. The urgency of this research lies in the need for an empirical evaluation of the effectiveness of e-government implementation at the local level, particularly in Banjarbaru City. The novelty of this research lies in the use of a qualitative approach with an input-process-output-outcome model of public service effectiveness analysis framework to assess digital-based population administration services at the sub-district level. The research problem formulation includes the effectiveness of e-government implementation, obstacles encountered, levels of public satisfaction, and factors influencing service optimization. The purpose of this study is to comprehensively analyze the implementation and impact of e-government on population administration services. The research method used is descriptive qualitative through in-depth interviews, observation, and documentation studies. The research results show that e-Government improves the efficiency and transparency of services, as well as public satisfaction, despite still facing infrastructure and digital literacy challenges. The study's conclusions emphasize that optimizing e-Government requires strengthening institutional capacity and service inclusiveness to achieve sustainable public service effectiveness
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