| Inter Governmental Philatelic Corporation |
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| Inter-Governmental Philatelic Corporation |
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| International Bank Note Co. |
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| International Security Printers Ltd. |
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| Interprint (Bradford) |
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| IPA, Asheridge Road, Chesham |
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| IPS Off. Carte Valori (Officina Governativa Carte Valori) |
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| Irish Security Stamp Printing (ISSP) |
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| Ist. Pol. Stato (IPS - Roma) |
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| Istituto Poligrafico e Zecca dello Stato |
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| ITVF |
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| Ivano-Frankivsk, regional department |
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| J. A. McMillan Ltd. |
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| J. Blaznikovi |
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| J. Margolinas lithography, Kaunas |
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| J. Pietrzykowski's printing house in Lublin |
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| J. Richardson, Auckland |
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| J. Tasset, Paris |
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| J.E. Wolfensberger AG, Birmensdorf |
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| J.F Celliers |
|