- Z A Computers
 - Sells and leases refurbished colour laptop computers.  Z-PC Systems
- Online retailer of personal computers, peripherals, and accessories.- Z-Tech Computers
- Offers online shopping.
- ZanTech Computers
- Building and servicing PC systems and servers.
- ZEN Computer Systems
- Zendex Corporation
- Manufactured microcomputer boards, systems, peripherals and related products for the Multibus and PC Bus industry.
- Zephyr Service Center
- Computer sales, parts and supplies, service and network support.
- Zeus Technology
- ZieglerSoft
- A hardware and software vendor specialising in Delphi components.
- ZipKATs' Computers & Consulting
- Computer retailer offering web design, repair, upgrade, consulting, and desktop services. Serves the upstate New York region.
- Zones, Inc.
- International direct marketer of brand name microchip-based hardware, software, accessories, and peripheral products for users of both PC and Macintosh operating systems.
- Zony Systems, Inc.
- Offers desktop computer systems, parts, monitors, accessories, software, and more.
- Zoommax Computers
- PC systems and hardware components.
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