EXHIBIT 21

DEVON ENERGY CORPORATION

List of Subsidiaries* as of January 1, 2016

1. Devon Energy Corporation (Oklahoma), an Oklahoma corporation

2. Devon OEI Holdings, L.L.C., a Delaware limited liability company

3. Devon OEI Operating, L.L.C., a Delaware limited liability company

4. Devon Energy Production Company, L.P., an Oklahoma limited partnership

5. Devon Financing Company, L.L.C., a Delaware limited liability company

6. Devon AXL, a general partnership registered in Alberta

7. Devon Canada Corporation, a Nova Scotia corporation

8. Devon Operating Company Ltd., an Alberta corporation

9. Devon Canada Holdings L.P., an Alberta limited partnership

10. Devon Canada, a general partnership registered in Alberta

11. Devon NEC Corporation, a Nova Scotia corporation

12. Devon Gas Co., L.L.C., a Delaware limited liability company

13. Devon Gas Services, L.P., a Texas limited partnership

14. Devon Energy International, Ltd., a Delaware corporation

15. Devon Uinta Basin Corporation, a Delaware corporation

16. Devon Realty Advisors, L.L.C., an Oklahoma limited liability company

17. Devon Headquarters, L.L.C., an Oklahoma limited liability company

18. EnLink Midstream, LLC, a Delaware limited liability company

19. EnLink Midstream Partners, LP, a Delaware limited partnership

20. Appalachian Oil Purchasers LLC, a Delaware limited liability company

21. Coronado Midstream LLC, a Texas limited liability company

22. E2 Appalachian Compression LLC, a Delaware limited liability company

23. EnLink Gas Marketing, LP, a Texas limited partnership

24. EnLink Midstream Holdings, LP, a Delaware limited partnership

25. EnLink Midstream Operating, LP, a Delaware limited partnership

26. EnLink Midstream Services, LLC, a Texas limited liability company

27. EnLink North Texas Gathering LP, a Texas limited partnership

28. LPC Crude Oil Marketing LLC, a Texas limited liability company

* The names of certain subsidiaries have been omitted since, considered in the aggregate as a single subsidiary, they would not constitute a significant subsidiary as of the end of the year covered by this report, as defined under Securities and Exchange Commission Regulation S-X, Rule 1-02(w).