In this study, considering different perspectives and concepts about customer relationship management (CRM), we try to investigate the significance of the correlation between each of the customer retention programs of CRM (loyalty programs, customer service, customization, and community) and customer retention. Data from 286 top bank managers of two governmental and two private Iranian bank branches were gathered in a field survey. The results of data analysis show the positive and significant correlation between each of the customer retention programs of CRM and customer retention. The study also finds the most significant correlation between customer service and customer retention.