Exhibit 21

DEVON ENERGY CORPORATION

Significant Subsidiaries

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 Energy International, Ltd., a Delaware corporation

6. Devon Operating Company Ltd., an Alberta corporation

7. Devon Canada Holdings LP, an Alberta limited partnership

8. Devon Canada Corporation, a Nova Scotia corporation

9. Devon AXL, a general partnership registered in Alberta

10. Devon NEC Corporation, a Nova Scotia corporation

11. Devon Canada, a general partnership registered in Alberta