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GSO Holiday Schedule

Contact Customer Service

Customer Service Center

The GSO Customer Service staff is here to help, and you can reach a live person at 800-322-5555 during business hours. For your convenience, you can log into your GSO account at any time to track a package, schedule a pickup, calculate rates, view transit times, and much more.

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


Phone: 800-322-5555 Extn 4


Phone: 800-322-5555 Extn 6
Fax: 408-543-8301

Corporate Address

4000 Executive Parkway
Suite 295
San Ramon, CA 94583