Just Servers
- Custom build and test servers for businesses. Based in Wharton, New Jersey.
- http://www.justservers.com/

JPMC, Inc.
- Wholesaler and retailer selling computer parts and components.
- http://jpmccom.net/

Jigsaw
- Sells computers, consumables, software and peripherals.
- http://www.jigsaw24.com

JT Computer Marketing, Inc.
- Sell and repairs PCs, also offers parts and upgrades.
- http://www.jtcomputer.com/

Jones Computer Service
- On-site computer repair, upgrade, and software training.
- http://www.jonescomputerservice.com

J-Tech Computers
- New and used computers, laptops, printers, monitors and components.
- http://www.jtech-computers.co.uk

J&J Electronics
- Sell custom built desktops, notebooks and servers. Provides computer service, networking, Web hosting, Web page design, Coldfusion applications and e-commerce.
- http://www.jjelect.com/

Jmac Electronics
- Online distributor of name brand computer components and peripherals.
- http://www.jmacelectronics.com

Jimco Services
- Computer parts and components.
- http://www.jimcoservices.com

J's Custom PCs
- Offers an online store, custom built PCs, parts, service, upgrades, and networking.
- http://www.jscustompcs.com/

JJTEK Computers
- Computers systems and parts.
- http://www.jjtek.co.uk/

JHCollier
- Retail sales of desktops, PCs, peripherals and components.
- http://www.jhcollier.com/

JDR Microdevices
- Offers complete computer systems, computer products and electronics components for businesses and individuals.
- http://www.jdr.com/

JBG Computer Services
- Buys and sells new and used computer equipment.
- http://www.jbg.co.uk