Exhibit 21

SUBSIDIARIES

OF

CHESAPEAKE ENERGY CORPORATION*

Oklahoma Corporation

Corporations	State of Organization
Chesapeake E&P Holding Corporation	Oklahoma
Chesapeake Energy Louisiana Corporation	Oklahoma
Chesapeake Energy Marketing, Inc.	Oklahoma
Chesapeake Operating, Inc.	Oklahoma
CHK Energy Holdings, Inc.	Texas
Limited Liability Companies
Chesapeake Appalachia, L.L.C.	Oklahoma
Chesapeake Exploration, L.L.C.	Oklahoma
Chesapeake Land Development Company, L.L.C.	Oklahoma
Chesapeake Midstream Development, L.L.C.	Oklahoma
Chesapeake Oilfield Operating, L.L.C.	Oklahoma
Chesapeake Cleveland Tonkawa, L.L.C.	Delaware
CHK Utica, L.L.C.	Delaware
COS Holdings, L.L.C.	Oklahoma
Nomac Drilling, L.L.C.	Oklahoma
Partnerships
Empress Louisiana Properties, L.P.	Oklahoma
* In accordance with Regulation S-K Item 601(b)(21), the names of particular subsidiaries that,considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary (as that term is defined in Rule 1-02(w) of Regulation S-X) as of the end of the year covered by this report have been omitted.