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EXHIBIT 21
ENTITY JURISDICTION
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ACCROSERV SRL Barbados
ACCROVEN SRL Barbados
Alliance Canada Marketing L.P. Alberta
Alliance Canada Marketing LTD Alberta
Apco Argentina, Inc. Cayman Islands
Apco Properties Ltd. Cayman Islands
Arctic Fox Assets, L.L.C. Delaware
Aspen Products Pipeline LLC Delaware
Aux Sable Canada Ltd. Alberta
Aux Sable Canada LP Alberta
Aux Sable Liquid Products Inc. Delaware
Aux Sable Liquid Products LP Alberta
Bargath Inc. Colorado
Barrett Fuels Corporation Delaware
Barrett Resources International Corporation Delaware
Barrett Resources Peru Corporation Delaware
Baton Rouge Fractionators LLC Delaware
Baton Rouge Pipeline LLC Delaware
Beech Grove Processing Company Tennessee
Bison Royalty LLC Delaware
Black Marlin Pipeline Company Texas
Carbon County UCG, Inc. Delaware
Cardinal Operating Company Delaware
Cardinal Pipeline Company, LLC North Carolina
Castle Associates, L.P. Delaware
Chacahoula Natural Gas Storage, LLC Delaware
Choctaw Natural Gas Storage, LLC Delaware
ChoiceSeat, L.L.C. Delaware
Cross Bay Operating Company Delaware
Cross Bay Pipeline Company, L.L.C. Delaware
Discovery Gas Transmission LLC Delaware
Discovery Producer Services LLC Delaware
Distributed Power Solutions L.L.C. Delaware
E-Birchtree, LLC Delaware
Energy International Corporation Pennsylvania
Energy News Live, LLC Delaware
E-Oaktree, LLC Delaware
ESPAGAS USA, Inc. Delaware
ESPAGAS, S.A. de C.V. Mexico
F T & T, Inc. Delaware
Fishhawk Ranch, Inc. Florida
FleetOne Inc. Delaware
FPT Marketing Company Limited Bermuda
Garrison, L.L.C. Delaware
Gas Supply, L.L.C. Delaware
Georgia Strait Crossing Pipeline LP Utah
Goebel Gathering Company, L.L.C. Delaware
GSX Canada Limited Partnership British Columbia
GSX Operating Company, LLC Delaware
GSX Pipeline, LLC Delaware
GSX Western Pipeline Company Delaware
Gulf Liquids Holdings LLC Delaware
Gulf Liquids New River Project LLC Delaware
Gulf Star Deepwater Services, LLC Delaware
Gulf Stream Natural Gas System, L.L.C. Delaware
Gulfstream Management & Operating Services, L.L.C. Delaware
Hazleton Fuel Management Company Delaware
Hazleton Pipeline Company Delaware
HI-BOL Pipeline Company Delaware
Inland Ports, Inc. Tennessee
Kiowa Gas Storage, L.L.C. Delaware
Laughton, L.L.C. Delaware
Liberty Operating Company Delaware
Longhorn Enterprises of Texas, Inc. Delaware
Longhorn Partners GP, L.L.C. Delaware
Longhorn Partners Pipeline, L.P. Delaware
MAPCO Alaska Inc. Alaska
MAPCO Canada Energy Inc. Canada
MAPCO Energy Services, L.L.C. Delaware
MAPCO Impressions Inc. Oklahoma
MAPCO Inc. DE Delaware
MAPL Investments, Inc. Delaware
Marsh Resources, Inc. Delaware
Mid-Continent Fractionation and Storage, LLC Delaware
Millennium Energy Fund, L.L.C. Delaware
Moriche Bank Ltd. Barbados
North Padre Island Spindown, Inc. Delaware
Northwest Alaskan Pipeline Company Delaware
Northwest Argentina Corporation Utah
Northwest Land Company Delaware
Northwest Pipeline Corporation Delaware
Parkco, L.L.C. Oklahoma
Parkco Two, L.L.C. Oklahoma
Piceance Production Holdings LLC Delaware
Pine Needle LNG Company, LLC North Carolina
Pine Needle Operating Company Delaware
Rainbow Resources, Inc. Colorado
Reserveco Inc. Delaware
Rio Vista Energy Marketing Company, L.L.C. Delaware
Rulison Production Company LLC Delaware
Servicios Williams International de Mexico S.A. de C.V. Mexico
Silver State Resources Management, LLC Delaware
Snow Goose Associates, L.L.C. Delaware
Sociedad Williams Enbridge y Compania Venezuela
Solutions EMT, Inc. Texas
Tennessee Processing Company Delaware
TGPL Enterprises, Inc. Delaware
TGPL Enterprises, LLC Delaware
The Tennessee Coal Company Delaware
Thermogas Energy, LLC Delaware
Touchstar Energy Technologies, Inc. Texas
Touchstar Technologies Pty Ltd. South Africa
TouchStar Technologies, L.L.C. Delaware
TransCardinal Company Delaware
TransCarolina LNG Company Delaware
Transco Coal Gas Company Delaware
Transco Cross Bay Company Delaware
Transco Energy Company Delaware
Transco Energy Investment Company Delaware
Transco Energy Marketing Company Delaware
Transco Exploration Company Delaware
Transco Gas Company Delaware
Transco Liberty Pipeline Company Delaware
Transco P-S Company Delaware
Transco Resources, Inc. Delaware
Transco Terminal Company Delaware
Transco Tower Realty, Inc. Delaware
Transcontinental Gas Pipe Line Corporation Delaware
Transeastern Gas Pipeline Company, Inc. Delaware
Tulsa Williams Company Delaware
TXG Gas Marketing Company Delaware
Valley View Coal, Inc. Tennessee
Volunteer - Williams, L.L.C. Delaware
WCG NOTE CORP., INC. Delaware
WEM&T Trading GmbH Austria
WFS - Liquids Company Delaware
WFS - NGL Pipeline Company, Inc. Delaware
WFS - Offshore Gathering Company Delaware
WFS - Pipeline Company Delaware
WFS Enterprises, Inc. Delaware
WFS Gathering Company, L.L.C. Delaware
WGP Enterprises, Inc. Delaware
WGP Gulfstream Pipeline Company, L.L.C. Delaware
WGP International Canada, Inc. New Brunswick
WHBC Holdings, LLC Delaware
WHBC, LLC Delaware
WHD Enterprises, LLC Delaware
Williams Acquisition Holding Company, Inc. (Del) Delaware
Williams Acquisition Holding Company, Inc. (NJ) New Jersey
Williams Aircraft, Inc. Delaware
Williams Alaska Air Cargo Properties, L.L.C. Alaska
Williams Alaska Petroleum, Inc. Alaska
Williams Alliance Canada Marketing, Inc. New Brunswick
Williams Arkoma Gathering Company, LLC Delaware
Williams Cove Point, Inc. Delaware
Williams Distributed Power Services, Inc. Delaware
Williams EnergIa Espana, S.L. Spain
Williams Energia Italia SRL Italy
Williams Energy Canada, Inc. New Brunswick
Williams Energy Company Delaware
Williams Energy European Services Ltd. United Kingdom
Williams Energy Marketing & Trading Canada, Inc. New Brunswick
Williams Energy Marketing & Trading Europe Ltd England
Williams Energy Marketing & Trading Holdings UK Ltd. United Kingdom
Williams Energy Network, Inc. Delaware
Williams Energy Services, LLC Delaware
Williams Energy Solutions, Inc. Delaware
Williams Energy, L.L.C. Delaware
Williams Environmental Services Company Delaware
Williams Equities, Inc. Delaware
Williams Exploration Company Delaware
Williams Express, Inc. AK Alaska
Williams Express, Inc. Delaware
Williams Fertilizer, Inc. Delaware
Williams Field Services - Gulf Coast Company, L.P. Delaware
Williams Field Services Company Delaware
Williams Field Services Group, Inc Delaware
Williams Flexible Generation, LLC Delaware
Williams Gas Company Delaware
Williams Gas Energy, Inc. Delaware
Williams Gas Pipeline - Alliance Canada, Inc. Alberta
Williams Gas Pipeline Company, LLC Delaware
Williams Gas Pipeline Mexico, S.A. de C.V. Mexico
Williams Gas Processing - Gulf Coast Company, L.P. Delaware
Williams Generation Company - Hazleton Delaware
Williams Global Energy Cayman Limited Cayman Islands
Williams Global Holdings Company Delaware
Williams GmbH Austria
Williams GP LLC Delaware
Williams GSR, L.L.C. Delaware
Williams Gulf Coast Gathering Company, LLC Delaware
Williams Headquarters Building Company Delaware
Williams Headquarters Building, L.L.C. Delaware
Williams Holdings GmbH Austria
Williams Hugoton Compression Services, Inc. Delaware
Williams Indonesia, L.L.C. Delaware
Williams Information Technology, Inc. Delaware
Williams International Bermuda Limited Bermuda
Williams International Company Delaware
Williams International de Mexico, S.A. de C.V. Mexico
Williams International Ecuadorian Ventures Bermuda Limited Bermuda
Williams International Investments Cayman Limited Cayman Islands
Williams International Jose Limited Cayman Islands
Williams International Oil & Gas Venezuela Limited Cayman Islands
Williams International Pigap Limited Cayman Islands
Williams International Services Company Nevada
Williams International Telecom Limited Delaware
Williams International Telecommunications Investments
Cayman Limited Cayman Islands
Williams International Venezuela Limited Cayman Islands
Williams International Ventures Bermuda Ltd. Bermuda
Williams Learning Center, Inc. Delaware
Williams Memphis Terminal, Inc. Delaware
Williams Merchant Services Company, Inc. Delaware
Williams Mid-South Pipelines, LLC Delaware
Williams Midstream Marketing and Risk Management, LLC Delaware
Williams Midstream Natural Gas Liquids, Inc. Delaware
Williams Mobile Bay Producer Services, L.L.C. Delaware
Williams Natural Gas Liquids Canada, Inc. Alberta
Williams Natural Gas Liquids, Inc. Delaware
Williams Natural Gas Storage, LLC Delaware
Williams New Soda, Inc. Delaware
Williams Oil Gathering, L.L.C. Delaware
Williams Olefins Feedstock Pipelines, L.L.C. Delaware
Williams Olefins, L.L.C. Delaware
Williams One-Call Services, Inc. Delaware
WILLIAMS PETROLEOS ESPANA, S.L. Spain
Williams Petroleum Pipeline Systems, Inc. Delaware
Williams Petroleum Services, LLC Delaware
Williams Pipeline Services Company Delaware
Williams Power Company, Inc. Delaware
Williams Production - Gulf Coast Company, L.P. Delaware
Williams Production Company, LLC Delaware
Williams Production Holdings LLC Delaware
Williams Production Mid-Continent Company Oklahoma
Williams Production RMT Company Delaware
Williams Production Rocky Mountain Company Delaware
Williams Refining & Marketing, L.L.C. Delaware
Williams Relocation Management, Inc. Delaware
Williams Resource Center, L.L.C. Delaware
Williams Risk Holdings, L.L.C. Delaware
Williams Risk Management L.L.C. Delaware
Williams Soda Holdings, LLC Delaware
Williams Sodium Products Company Delaware
Williams Strategic Sourcing Company Delaware
Williams Strategic Ventures, LLC Delaware
Williams Trading UK Ltd. United Kingdom
Williams TravelCenters, Inc. Delaware
Williams Underground Gas Storage Company Delaware
Williams Western Holding Company, Inc. Delaware
Williams Wireless, Inc. Delaware
Williams WPC - I, Inc. Delaware
Williams WPC - II, Inc. Delaware
Williams WPC International Company Delaware
WilMart, Inc. Delaware
WilPro Energy Services El Furrial Limited Cayman Islands
WilPro Energy Services Pigap II Limited Cayman Islands
Worldwide Services Limited Cayman Islands
WPX Enterprises, Inc. Delaware
WPX Gas Resources Company Delaware