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- XETA Technologies Inc
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- Xo One
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- Xpedite Systems Inc
- Xspand
- Xspedius Communications
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- Xspedius Management Co
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- Xspedius Management Co
- Xspedius Management Co
- Xtel Technical Svc Inc
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- Y2ktel.Com Systems
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- Yankee Microwave
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- Yellow Book USA
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- York Telecom
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- York Telephones
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- Young's Telecommunications Svc
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- Z Com Technical Svc Inc
- Z-Tel
- Zack Vision
- Zand-Tel Communications
- Zavaleta Broadcasting Group
- ZBZ Enterprises
- Zebley's Corner Telephone Inc
- Zen-Tel Inc
- Ziadeh Imports
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- Znet Telecom 2125 1 Av Hibbing
- Zone Telecom
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- Zone Telecom Inc
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- Zydacron Inc
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