ShareThis Toastmasters International World Headquarters 23182 Arroyo Vista Rancho Santa Margarita, CA 92688-2620 Phone: 949-858-8255 Directions from Interstate 5: Exit Oso Parkway and go East (2.5 miles) Left on Antonio Parkway (3.1 miles) Left on Banderas (.2 miles) Right on Arroyo Vista (125 feet) It is the third commercial building on the right. Please park in the visitor's lot near the flags in front of the building. Google Maps