- Charles Moskowitz
- Charles T Evans Trust
- Charter Energy Inc
- Chase Oil Corp
- Chase Production Co
- Chaston Oil & Gas
- Chatsworth Oil & Gas
- Cheema Oil Corp
- Cheema Oil Corp
- Cheema Oil LLC
- Cheker Oil Co
- Cheker Oil Co
- Chemco Inc
- Cheniere Energy Inc
- Cher Oil Co LTD
- Chervon
- Chervon
- Chesapeake Energy
- Chesapeake Oil Co
- Chesapeake Operating Inc
- Chesapeake Operating Inc
- Chesapeake Operating Inc
- Cheshire Oil Co
- Chevron
- Chevron Corp
- Chevron Exploration
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco
- Chevron Texaco Production Co
- Chevron USA Inc-Sibley Oil
- Chevron USA Production Co
- Chevron USA Production Co
- Chevron USA Production Co
- Chevron USA Production Co
- Chevrontexaco
- Cheyenne Oil Properties
- Chicagoland Oil Co
- Chico Drain Oil Svc
- Chief Oil & Gas
- Chief Oil & Gas
- Chief Operating Co
- Childress W R Oil Co
- Chisos Operating Inc
- Chiu Gee Oil
- Choate Interprises
- Choctaw Oil & Gas
- Cholla Petroleum Co
- Cholla Petroleum Inc
- Chorney Oil Co
- Christensen Oil Co
- Christensen Oil Co
- Christian Oil
- Christian Oil Co
- Christian Oil Dist Co
- Christy Halsey Oil
- Christy-Halsey Oil Co Chester
- Chromcak Co
- Cima Capitan
- Cimarex Energy Co
- Cimarex Energy Co
- Cimarex Energy Co
- Cimarex Energy Co
- Cimarex Energy Co
- Cimarex Energy Co
- Cimarex Energy Co
- Cimarex Energy Co
- Cimarex Energy Co
- Cimarex Energy Co
- CIR Oil Co
- Circle Dot Oil & Gas
- Circle S Oil & Gas Co
- Circle S Oil & Gas Co
- Circle X Oil & Gas
- Cirrus Production Co
- Citation Oil & Gas
- Citation Oil & Gas
- Citation Oil & Gas
- Citation Oil & Gas
- Citation Oil & Gas
- Citation Oil & Gas Co
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil & Gas Corp
- Citation Oil Gas Corp
- Citgo
- Cities Serv Oil Co
- Citizens Oil Co-Op Inc
- Citrus Entergy Corp
- City Of New Haven Natural Gas
- CKL & Assoc Inc
- Clark Nolan Oil Prop Ofc
- Clark Oil
- Clark Oil & Refining Corp
- Clark Oil & Refining Corp
- Classic Energy Inc
- Classic Oil Of Watertown
- Classic Oil Supply
- Claxton Oil Co
- Clay Petroleum
- Clayton Williams Energy
- Clayton Williams Energy Inc
- Clepco
- Cliffwood Production Co
- Clifton John & Sons Crude Oil
- Cline LTD
- Cline Production Co
- Cline Production Co
- Clinton Enterprises
- Clinton-Newberry Natural Gas
- Clinton-Newberry Natural Gas
- Clipper Oil
- Cloew Oil Co
- Clough Oil Co
- Clough Oil Co
- Clowe Oil Co
- Clyde E Davis
- Clyde Petroleum Inc
- CNG Producing Co
- CNS Energy Inc
- CNS Energy Inc
- Coal Oil & Gas
- Coalinga Corp
- Coast Oil Co LLC
- Coastal
- Coastal Field Svc Co
- Coastal Field Svc Co
- Coastal Oil
- Coastal Oil
- Coastal Oil & Gas
- Coastal Oil & Gas Corp
- Coastal Oil & Gas Holdings Inc
- Coastal Production Co
- Coastal States
- Cobra Oil
- Cobra Oil & Gas
- Cobra Oil & Gas
- Cobra Oil & Gas Corp
- Cobra Oil & Gas Corp
- Cobra Oil & Gas Corp
- Cobra Resources LLC
- Cockrell Production Co
- Cockrell Production Co
- Cod Oil Dealers
- Cog Operating
- Coho Resources Inc
- Coin Corp
- Colborn Co Inc
- Colbrook Oil Co
- Coldwater Productions
- Coleman Oil
- Coleman Oil & Gas Inc
- Coleman Oil & Gas Inc
- Coleman Oil & Gas Inc
- Coleman Oil Co
- Coleman Oil Co
- Coleman Oil Co
- Coles Energy
- Collins Brothers Oil Co
- Collins Brothers Oil Co
- Collins Brothers Oil Co
- Collins Oil & Propane
- Colloil Inc
- Cologne Production Co
- Cologne Production Co
- Cologne Production Co
- Cologne Production Co Inc
- Colonial Oil
- Colonial Oil Co
- Colonial Production Co
- Colonial Production Co
- Colorado Natural Gas Inc
- Colt Energy Inc
- Colt Energy Inc
- Colton LLC
- Colton LLC
- Columbia Natural Resources Inc
- Columbia Natural Resources Inc
- Columbia Oil
- Columbia Oil Co Inc
- Columbus Oil Co
- Colvin Oil Co
- Comanche Resources Co
- Comer Royalty & Property Co
- Comet Oil Co
- Comfort Oil Co
- Commander Oil Co LTD
- Commander Oil Co LTD
- Commercial Brokerage Corp
- Community Oil Tractor Repair
- Compadre Roustabout
- Compass Transportation
- Comstock Oil & Gas
- Comstock Oil & Gas
- Comstock Oil & Gas
- Comstock Oil & Gas
- Concept Recovery Inc
- Concord Oil Corp
- Condor Operating Co
- Cone Oil
- Cone Oil Number 123
- Conejo Mobile Oil
- Confed Oil & Gas
- Conn Energy Inc
- Conn Energy Inc
- Connell Oil
- Connelly Exploration
- Connelly Exploration
- Connoil LLC
- Conoco
- Conoco Oil Co
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips
- Conoco Phillips Alaska
- Conoco Phillips Alaska
- Conoco Phillips Alaska
- Conoco Phillips Alaska
- Conoco Phillips Alaska Inc
- Conoco-Louisiana Gas Systems
- Conquistador Petroleum
- Conservancy Oil
- Consolidated Energy Investment
- Consolidated Oil & Gas
- Consolidated Oil Co
- Consolidated Oil Co
- Consolidated Production Inc
- Constitution Gas Transport Co
- Constitution Petroleum Co
- Contex Oil Co
- Continental Natural Gas Inc
- Continental Oil Co
- Continental Oil Co
- Continental Pipe Line
- Continental Resources Inc
- Continental Resources Inc
- Continental Resources Inc
- Continental Resources Of IL
- Continental Resources Of IL
- Continental Resources Of IL
- Continental Resources Of IL
- Continentel Operating Co
- Continual Oil & Gas Inc
- Continual Oil & Gas Inc
- Control Room
- Conway Oil Co
- Conway Oil Co
- Cook & Co Oil Well Servicing
- Cook Investments
- Cook Oil Co
- Coomer Oil LLC
- Cooper Glen W Oil Prodrs
- Cooper Oil & Gas Inc
- Cooper Oil Co
- Copano Co
- COPANO-Tc Oil Co Office
- Coppedge Oil & Gas Inc
- Coppedge Oil & Gas Inc
- Coral Coast Petroleum
- Coral Production Corp
