- Ohio Valley Gas Inc
- Oilco Gas Co
- Okaloosa County Gas District
- Okaloosa Gas District
- Okaloosa Gas District
- Okaloosa Gas District
- Oklahoma Liquefied Gas
- Oklahoma Natural Gas Co
- Oklahoma Natural Gas Co
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- Oklahoma Natural Gas Co
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- Olney Fuel & Supply
- Ominex Canada LTD
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- One Stop
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- ONG
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- Optigas
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- Pacific Gas & Electric Co
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- Potenkin Industries Inc
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- Powell Valley Gas Utility Dist
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- Proficient Gas Lift Svc LLC
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