Cooperatives play a strategic role in supporting the Indonesian economy, particularly through savings and loan programs aimed at improving the welfare of their members. One cooperative active in this area is the Alkhariyah Madani Residents' Cooperative in Panosogan Village, Cikeusal District, Serang Regency. However, this cooperative faces challenges in determining which members are eligible for priority loans. This is because the selection process is still carried out conventionally without the support of a technology-based system, is subjective, and prone to errors. This can lead to inaccurate decisions, the risk of bad debts, and injustice for members. This study aims to create a Decision Support System (DSS) that can assist cooperatives in determining which members are eligible and eligible for priority loans more efficiently, objectively, and transparently. This system uses the Weighted Product (WP) method and is developed with a prototype method approach, which allows for multi-criteria evaluation based on the weighted importance of each criterion. Based on the implementation and testing results of 5 candidate alternatives across 5 weighted criteria (application order, income, loan amount, loan duration, and age), the WP method successfully identified Alternative A2 as the top-priority loan candidate with the highest preference score of 0.26186. Black Box testing confirmed that all system functionalities operated as expected. Thus, this system provides an objective, transparent, and accurate decision-making tool for cooperative management. Thus, this system provides a practical solution for cooperatives in managing loans and has the potential to be implemented in other cooperatives facing similar problems.