<p>This study aims to identify effect of application of e-government with its dimensions (cost reduction, HR efficiency, transparency, and service quality) on the job performance with its dimensions (task completion, job loyalty and staff compliance) in the Greater Amman Municipality. The study uses the descriptive analytical method (theoretical and field), and (245) questionnaires were distributed to all administrative staff in the Municipality. The study shows a number of results; the most important of which are that there is an evident effect of application of e-government on the staff performance, compliance of employees with regulations and instructions, and the transactions are characterized by accuracy and quality unlike the situation in the past. The study recommends that it is necessary to increase incentives so that staff's loyalty gets greater, and that it is important to make ongoing improvement to maintain the present distinct performance level.</p>