Exhibit 21
ONEOK, Inc.
SUBSIDIARIES OF THE COMPANY
Divisions
Oklahoma Natural Gas Company, a division of ONEOK, Inc.
Kansas Gas Service Company, a division of ONEOK, Inc.
Texas Gas Service Company, a division of ONEOK, Inc.
| State of | |
| Incorporation | |
| Subsidiaries | or Organization |
| Kansas Gas Marketing Company | Kansas |
| ONEOK Partners GP, L.L.C. | Delaware |
| NBP Services, LLC | Delaware |
| ONEOK Energy Services Canada, Ltd. | Yukon |
| ONEOK Energy Services Company, II | Delaware |
| ONEOK Energy Services Company, L.P. | Texas |
| ONEOK Energy Services Holdings, L.L.C. | Oklahoma |
| ONEOK Kansas Company | Kansas |
| ONEOK Kansas Properties, L.L.C. | Kansas |
| ONEOK Leasing Company | Delaware |
| ONEOK Parking Company, L.L.C. | Delaware |
| ONEOK Services Company | Oklahoma |
| ONEOK Texas Resources, Inc. | Delaware |
| ONEOK Partners, L.P. | Delaware |
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ONEOK Partners, L.P.
| Subsidiaries of ONEOK Partners, L.P. | |
| ONEOK Partners Intermediate Limited Partnership | Delaware |
| ONEOK ILP GP, L.L.C. | Delaware |
| ONEOK Rockies Investments, L.L.C. | Delaware |
| ONEOK Rockies Midstream, L.L.C. | Delaware |
| ONEOK Rockies Company (Canada), Ltd. | Alberta |
| ONEOK Rockies Enterprises, L.L.C. | Delaware |
| Border Minnesota Pipeline, LLC | Delaware |
| Black Mesa Holdings, Inc. | Delaware |
| Black Mesa Pipeline, Inc. | Delaware |
| Black Mesa Pipeline Operations, L.L.C. | Delaware |
| Black Mesa Technologies, Inc. | Oklahoma |
| Border Midstream Services, Ltd. | Alberta |
| Border Midwestern Company | Delaware |
| Midwestern Gas Transmission Company | Delaware |
| Border Viking Company | Delaware |
| Viking Gas Transmission Company | Delaware |
| Crestone Energy Ventures, L.L.C. | Delaware |
| Crestone Bighorn, L.L.C. | Delaware |
| Crestone Gathering Services, L.L.C. | Delaware |
| Crestone Powder River, L.L.C. | Delaware |
| Crestone Wind River, L.L.C. | Delaware |
| Northern Border Pipeline Company (general partnership) (50%) | Texas |
| Guardian Pipeline, L.L.C. | Delaware |
| Bighorn Gas Gathering, L.L.C. (49%) | Delaware |
| Fort Union Gas Gathering, L.L.C. (37.04%) | Delaware |
| Lost Creek Gathering Company, L.L.C. (35%) | Delaware |
| Chisholm Pipeline Company (50%) | Delaware |
| Chisholm Pipeline Holdings, L.L.C. | Delaware |
| Mid Continent Market Center, L.L.C. | Kansas |
| OkTex Pipeline Company, L.L.C. | Delaware |
| ONEOK Arbuckle Pipeline, L.L.C. | Delaware |
| ONEOK Arbuckle North Pipeline, L.L.C. | Delaware |
| ONEOK Arbuckle Land Company | Texas |
| ONEOK Bakken Pipeline, L.L.C. | Delaware |
| ONEOK Bushton Processing, L.L.C. | Delaware |
| ONEOK Field Services Company, L.L.C. | Oklahoma |
| ONEOK Gas Storage Holdings, L.L.C. | Delaware |
| ONEOK Gas Storage, L.L.C. | Oklahoma |
| ONEOK Gas Transportation, L.L.C. | Oklahoma |
| ONEOK Hydrocarbon, L.L.C. | Delaware |
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| ONEOK Hydrocarbon, L.P. | Delaware |
| ONEOK Hydrocarbon GP, L.L.C. | Delaware |
| ONEOK Hydrocarbon Holdings, L.L.C. | Delaware |
| ONEOK Hydrocarbon Southwest, L.L.C. | Delaware |
| ONEOK MB I, L.P. | Delaware |
| ONEOK Midstream Gas Supply, L.L.C. | Oklahoma |
| ONEOK Mont Belvieu Storage Company, L.L.C. | Delaware |
| ONEOK NGL Pipeline, L.L.C. | Delaware |
| ONEOK NGL Gathering, L.L.C. | Delaware |
| ONEOK North System, L.L.C. | Delaware |
| ONEOK Overland Pass Holdings, L.L.C. | Oklahoma |
| ONEOK Pipeline Holdings, L.L.C. | Delaware |
| ONEOK Sterling III Pipline, L.L.C. | Oklahoma |
| ONEOK Texas Gas Storage, L.L.C. | Texas |
| ONEOK Transmission Company, L.L.C. | Delaware |
| ONEOK Underground Storage Company, L.L.C. | Kansas |
| ONEOK VESCO Holdings, L.L.C. | Delaware |
| ONEOK WesTex Transmission, L.L.C. | Delaware |
| Overland Pass Pipeline Company LLC (50%) | Delaware |
| Potato Hills Gas Gathering System (general partnership) (51%) | Oklahoma |
| Sycamore Gas System (general partnership) (48.445%) | Oklahoma |
| Venice Energy Services Company, L.L.C. (10.1756%) | Delaware |
| Mont Belvieu I Fractionation Facility (joint venture) (80%) | Texas |
| Heartland Pipeline Company (general partnership) (50%) | Texas |
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