Pipeline Transportation Service Companies
| Williams Gas Pipelines Transco (Manassas, VA)
Primarily Serving: Centreville, VA - Burke, VA - Annandale, VA - Reston, VA |
| Williams Gas Pipelines Transco (Wakita, OK)
Primarily Serving: Wichita, KS - Edmond, OK - Cleveland, OK - Oklahoma City, OK |
| Williams Gas Pipelines Transco (Austin, PA)
Primarily Serving: Buffalo, NY - East Amherst, NY - Rochester, NY - Erie, PA |
| Williams Gas Pipelines Transco (Houston, TX)
Primarily Serving: Pasadena, TX - Missouri City, TX - Sugar Land, TX - League City, TX |
| Williams Gas Pipelines Transco (Citronelle, AL)
Primarily Serving: Mobile, AL - Hattiesburg, MS - Gulfport, MS - Pensacola, FL |
| Williston Basin Interstate (Billings, MT)
Primarily Serving: Great Falls, MT - Casper, WY - Idaho Falls, ID |
| Williston Basin Interstate (Baker, MT)
Primarily Serving: Rapid City, SD - Bismarck, ND - Billings, MT |
| Williston Basin Interstate (Gillette, WY)
Primarily Serving: Casper, WY - Rapid City, SD - Billings, MT - Cheyenne, WY |
| Wolverine Pipe Line (Pullman, MI)
Primarily Serving: Kalamazoo, MI - Wyoming, MI - Grand Rapids, MI - Battle Creek, MI |
| Wolverine Pipe Line (Marshall, MI)
Primarily Serving: Battle Creek, MI - Kalamazoo, MI - Lansing, MI - Wyoming, MI |
| Wolverine Pipeline Co (Detroit, MI)
Primarily Serving: Dearborn, MI - Warren, MI - Dearborn Heights, MI - Royal Oak, MI |
| Wolverine Pipeline Co (Allen Park, MI)
Primarily Serving: Dearborn, MI - Taylor, MI - Dearborn Heights, MI - Westland, MI |
| Wyco Pipeline Co (Cheyenne, WY)
Primarily Serving: Fort Collins, CO - Greeley, CO - Loveland, CO - Longmont, CO |
| Zaplok Pipeline Systems (Houston, TX)
Primarily Serving: Pasadena, TX - Missouri City, TX - Sugar Land, TX - League City, TX |
