Emergency Room - St. Mary’s Medical Center is an emergency room that offers many services, including emergency medicine, pediatric emergency care, and have a level II trauma center. Visit Emergency Room - St. Mary’s Medical Center located at 450 Stanyan St, San Francisco, CA. This San Francisco emergency room is one of the best in California. As part of the Dignity Health network, Emergency Room - St. Mary’s Medical Center is dedicated to delivering high quality, compassionate care and access to San Francisco and nearby communities.