Golden State Overnight (GSO) Tracking

Golden State Overnight (GSO) Tracking allowing you to track your GLS-USA Package, Express Freight, Shipping Carrier status online in real-time. Locate your package during transit using your unique Bill Number.

Golden State Overnight (GSO) Customer Support

Phone number: 1-800-322-5555
Email ID: customerservice@gls-us.com
Head Office Address: GLS US, 4000 Executive Parkway, Suite 295, San Ramon, CA 94583

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