HP® Customer Service Phone Number: 1-800-474-6836 HP is an American maker of printers, laptops, pcs, digital cameras, computer servers, and networking solutions. HP Corporate 3000 Hanover Street Palo Alto, California 94304 USA Hours M - F 24-7 More Phone Numbers Tech Support: 1-877-219-6676 Commercial Support: 1-877-219-6676 Corporate Phone: 1-650-857-1501