Visit Us in San Marcos, California

Welcome to AT&T’s convenient kiosk located within the spacious Costco Business Center, a destination set apart with dedicated parking, ensuring your visit is easy and stress-free. Our location is strategically positioned right across the street from a bustling small plaza shopping center, neatly tucked between freeways for easy access and departure.

As soon as you step into Costco, you’ll find our AT&T kiosk welcoming you right at the entrance, nestled comfortably within the appliances department. This prime location allows you to quickly address your AT&T service needs, whether that be setting up a new service, upgrading your device, or simply seeking advice on the latest offerings.

Our knowledgeable and friendly AT&T staff are always ready to assist, providing the quality service and expertise you’ve come to expect from AT&T. We invite you to visit us on your next Costco run for a seamless and convenient AT&T experience. Let us be your one-stop-shop for all your AT&T needs.

Store Hours

  • Sunday: 7:00 AM - 6:00 PM
  • Monday: 7:00 AM - 6:00 PM
  • Tuesday: 7:00 AM - 6:00 PM
  • Wednesday: 7:00 AM - 6:00 PM
  • Thursday: 7:00 AM - 6:00 PM
  • Friday: 7:00 AM - 6:00 PM
  • Saturday: 7:00 AM - 6:00 PM

*Hours may vary by store

Map to Store

Store Info

Costco

150 S. Bent Ave
San Marcos, California 92078

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Current as of November 18, 2025 • This site updates daily. Always fetch live content.

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