Exhibit 21

DEVON ENERGY CORPORATION

Significant Subsidiaries

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

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

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

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

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

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 LP, an Alberta limited partnership

10. Devon Canada, a general partnership registered in Alberta

11. Devon NEC Corporation, a Nova Scotia corporation