Emergency Room - St. John's Regional Medical Center is an emergency room that offers many services, including a STEMI heart attack center, primary stroke center, and emergency medicine. Visit Emergency Room - St. John's Regional Medical Center located at 1600 N Rose Ave, Oxnard, CA. This Oxnard emergency room is one of the best in California. As part of the Dignity Health network, Emergency Room - St. John's Regional Medical Center is dedicated to delivering high quality, compassionate care and access to Oxnard and nearby communities.