Castellanos, Alexander F. M.D. Share: Medical Castellanos, Alexander F. M.D. Visit Website 699 S. Main Street, Suite A Templeton, California 93465 (805) 434-1804 www.templetondoc.com About Map About Today's Medicine for Tommorrow's Health. " We are a unique family practice team that combines proactive medicine with a strong patient/physician relationship." What's Nearby? Distance: 5 10 15 20 25 50 mi.