Products
- Cincinnati, Indianapolis, St. Louis and Chicago Railway Company
- Cincinnati, Indianapolis, St. Louis and Chicago Railway Company (Signed by Melville Ingalls)
- Cincinnati, Lafayette and Chicago Railroad Company
- Cincinnati, Lafayette and Chicago Railroad Company (Signed by Adams Earl)
- Cincinnati, Lafayette and Chicago Railroad Company (Signed by Adams Earl)
- Cincinnati, Lebanon and Northern Railway Company
- Cincinnati, New Orleans & Texas Pacific Railway Company
- Cincinnati, New Orleans & Texas Pacific Railway Company
- Cincinnati, New Orleans & Texas Pacific Railway Company
- Cincinnati, New Orleans & Texas Pacific Railway Company
- Cincinnati, Newport and Covington Railway Company
- Cincinnati, Newport and Covington Railway Company
- Cincinnati, Portsmouth and Virginia Railroad Company
- Cincinnati, Portsmouth and Virginia Railroad Company
- Cincinnati, Richmond and Fort Wayne Railroad Company
- Cincinnati, Sandusky and Cleveland Rail Road Company
- Cincinnati, Sandusky and Cleveland Rail Road Company
- Cincinnati, Wabash and Michigan Railway Company
- Cincinnati, Washington and Baltimore Railroad Company
- Cincinnati, Washington and Baltimore Railroad Company
- Cincinnati, Washington and Baltimore Railroad Company (Signed by Orland Smith)
- Cincinnati, Washington and Baltimore Railroad Company (Signed by Orland Smith)
- Cincinnati, Washington and Baltimore Railroad Company (Signed by Orland Smith)
- Cincinnati, Washington and Baltimore Railroad Company (Signed by Orland Smith)
- Cincinnati, Wilmington & Zanesville Rail Road Company
- Cinerama, Inc.
- Cities Service Company (Citgo)
- Cities Service Company (Citgo)
- Cities Service Company (Citgo)
- Citizens Bank of Michigan City, Indiana
- Citizens Passenger Railway Company
- Citizens Passenger Railway Company (Harrisburg, Steelton and Oberlin)
- Citizens' Electric Company
- Citizens' Street Railroad Company of Shelby County, Tennessee
- Citizens' Street Railroad Company of Shelby County, Tennessee
- City and Suburban Railway Co.
- City and Suburban Railway Co.
- City Ice & Fuel Company
- City Investing Company
- City of Boston (Signed by Mayor Josiah Quincy Jr., Dated 1848)
- City Railway Company of Dayton, Ohio
- City Railway Company of Dayton, Ohio
- Clarence Saunders Stores, Inc.
- Clark Equipment Overseas Finance Corporation
- Clarksburg, Weston and Glenville Railroad and Transportation Company
- Clarksburg-Columbus Short Route Bridge Company
- Classic City Arena Company, Limited (Hockey)
- Clay Hotel Corporation (Kentucky)
- Clay Products Company of Cuba
- Clearfield and Mahoning Railway Company
- Cleveland & Toledo Rail-Road Company
- Cleveland and Mahoning Rail Road Company
- Cleveland and Pittsburgh Railroad Company
- Cleveland and Pittsburgh Railroad Company
- Cleveland and Pittsburgh Railroad Company (Akron Branch)
- Cleveland and Sandusky Brewing Company
- Cleveland Builders Supply Co.
- Cleveland Discount Company
- Cleveland Gas Light and Coke Company
- Cleveland Short Line Railway Company
- Cleveland, Akron and Columbus Railway Company
- Cleveland, Cincinnati, Chicago & St. Louis Railway Company
- Cleveland, Cincinnati, Chicago & St. Louis Railway Company
- Cleveland, Cincinnati, Chicago & St. Louis Railway Company
- Cleveland, Cincinnati, Chicago and St. Louis Railway Company
- Cleveland, Cincinnati, Chicago and St. Louis Railway Company
- Cleveland, Cincinnati, Chicago and St. Louis Railway Company
- Cleveland, Cincinnati, Chicago and St. Louis Railway Company
- Cleveland, Cincinnati, Chicago and St. Louis Railway Company
- Cleveland, Columbus, Cincinnati & Indianapolis Railway Company
- Cleveland, Columbus, Cincinnati and Indianapolis Railway Company
- Cleveland, Columbus, Cincinnati and Indianapolis Railway Company
- Cleveland, Columbus, Cincinnati and Indianapolis Railway Company (Signed by John Henry Devereux)
- Cleveland, Columbus, Cincinnati and Indianapolis Railway Company (Signed by John Henry Devereux)
- Cleveland, Columbus, Cincinnati and Indianapolis Railway Company (Signed by John Henry Devereux)
- Cleveland, Lorain and Wheeling Railway Company
- Cleveland, Lorain and Wheeling Railway Company (Signed by Eugene Zimmerman)
- Cleveland, Painesville and Ashtabula Rail Road Company
- Cleveland, Painesville and Ashtabula Rail Road Company
- Cleveland, Painsville and Ashtabula Rail Road Company
- Clevite Corporation
- Cliff File Company
- Clinton Cafeteria Company, Inc.
- Clinton Foods, Inc. (Hi-C, Snow Crop)
- Clinton Mills, Inc.
- Clinton Trust Company
- Coal River and Western Railway Company
- Coal River Railway Company
- Coastal Airways, Inc.
- Coastal Corporation
- Coastal Corporation
- Coastal States Gas Producing Company
- Coca-Cola Company
- Cochecho Rail Road Company
- Coeur d'Alene Railway & Navigation Company
- Coeur d'Alene Railway & Navigation Company (Signed by Daniel Chase Corbin)
- Coherent Radiation
- Cole Motor Car Company
- Cole Motor Car Company
- Cole Motor Car Company