California State University San Marcos California State University San Marcos Search | Advanced Search | New Members | Coupons and Discounts | All Categories Other >> Education - Colleges & Universities California State University San Marcos 333 S. Twin Oaks Valley Rd.San Marcos, CA 92078 | View on Google Maps Sarah Villarreal (760) 750-8700 Visit Site Member Since: 2005 Send a message to: California State University San Marcos Your Name: Your Email: Subject: Message: (Date: 3/23/2023)