Contact Customer Service

Customer Service Center

The Customer Service Center is the main live contact for GSO customers. We encourage our customers to use the GSO website for tracking, pickup, rating and other questions, but a live person is always available at 800-322-5555.

Hours of Operation

GSO Customer Service Center departments are staffed from 7:00 a.m. to 8:00 p.m. Monday through Friday and from 7:00 a.m. to 4:00 p.m. on Saturday. Customer Service staff are available only for emergency situations after hours and on Sundays and holidays.

Customer Service

Phone: 800-322-5555
Fax: 916-636-5101
Email: customerservice@gso.com

Sales

Phone: 800-322-5555
Email: sales@gso.com

Billing

Phone: 800-322-5555
Fax: 408-543-8301
Email: billing@gso.com

Corporate Address

Golden State Overnight
7901 Stoneridge Drive
Suite 400
Pleasanton, CA 94588