My RSM is the official mobile app for the City of Rancho Santa Margarita, California. This app provides a connection and an additional avenue of communication between the City of RSM and its residents, business owners, and visitors. With this app you will enjoy the convenient access of the City calendar, news articles, notifications and much more. Have all the important and up to date information related to the City Council, property taxes, classes and events, at the touch of a button.