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Exhibit 21.1
List of Subsidiaries of WPX Energy, Inc.
(all Delaware entities unless otherwise indicated)
1Cardinal Oil and Gas Holdings, LLC
                   DBA in New Mexico and Texas as: Cardinal Exploration & Production, LLC
2Catalyst Midstream Partners, LLC
3Oryx Delaware Holdings, LLC
4Stateline Crude, LLC - an Oklahoma LLC
5Stateline Gathering, LLC - an Oklahoma LLC
6Stateline Marketing, LLC
7Stateline Processing, LLC - an Oklahoma LLC
8Stateline Storage, LLC
9Stateline Water, LLC - an Oklahoma LLC
10Twin Buttes Gathering LLC
11WPX Energy Gulf Coast, LP
12WPX Energy Headquarters, LLC
13WPX Energy Holdings, LLC
14WPX Energy Keystone, LLC
15WPX Energy Marketing, LLC
16WPX Energy Mid-Continent Company, an Oklahoma corporation
17WPX Energy Mineral Partners, LP
18WPX Energy Mineral Holdings GP, LLC
19WPX Energy Mineral Holdings LP, LLC
20WPX Energy Non-Op Partners, LP
21WPX Energy Non-Op Holdings GP, LLC
22WPX Energy Non-Op Holdings LP, LLC
23WPX Energy Permian, LLC
24WPX Energy Production, LLC
25WPX Energy Services Company, LLC
26
WPX Energy Williston, LLC (Trade name in North Dakota: D3 E & P LLC)
27WPX Permian Midstream Crude Holdings, LLC
28WPX Permian Midstream Holdings, LLC
29WPX Permian Midstream Residue Holdings, LLC
30WPX Permian Surface Holdings, LLC
International subsidiaries:
1WPX Energy International Oil & Gas (Venezuela), Ltd. – a Cayman Islands corporation