The development of a Web-based Geographic Information System and Mosquito Larvae Monitoring Program by Cadres has been successfully implemented as a solution to facilitate the cadres in conducting larvae monitoring surveys. The main objective of this research is to monitor the number of mosquito larvae in Aceh Besar District using a more efficient method and provide real-time mappable information. In this endeavor, a dedicated programming program was designed to facilitate the cadres in quickly collecting and securely storing larvae data, which can be directly accessed by the Public Health Center (Puskesmas) and the public. Consequently, preventive measures against Dengue Fever (DF) can be promptly implemented. This program is known as the Geographic Information System and Larvae Monitoring Program (SIG-PJ). The SIG-PJ application caters to three user types: cadres, administrators, and the public. Cadres are responsible for conducting surveys and inputting larvae data, while administrators manage and oversee the data. The application's dashboard in SIG-PJ allows the public to view a comprehensive summary of larvae data, including the total number of larvae, the overall coverage area, the results of larvae data from all villages, a distribution map of larvae, and an index value derived from the entire dataset. This information aids in identifying high-risk areas and implementing targeted prevention strategies.