| Bureau of Engraving & Printing | Internal Revenue Office, New York City (O) |
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| Bureau of Engraving & Printing | National Bank Note Company |
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| Butler and Carpenter |
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| C & C Printing |
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| C & D Associates (Cuffley) |
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| C. Valiente Mendoza |
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| Cambec Press, Melbourne |
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| Canada Post |
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| Canadian Bank Note Company |
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| Canadian Bank Note Company | The Lowe-Martin Group |
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| Cardon Enterprise Company, Ltd. |
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| Carl Friedrich Fuchs |
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| Carl Jensen & Schwidernoch, Vienna |
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| Carre d'encre |
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| Carte Valori Turati Lombardi, Milano |
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| Cartor |
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| Cartor Security Printers, France |
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| Cartor Security Printing |
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| Cartor Security Printing | car |
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| Cartor Security Printing, France |
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