province | Buenos Aires Province | Transvaal Province | Katanga Province | Cape Province | Western Province | New Ireland Province | Kars Province | Pichincha Province | Santa Fe Province | Dewa Province | Entre Ríos Province | Roman province | Rhine Province | Natal Province | Helmand Province | Battambang Province | La Convención Province | Hakkâri Province | Western Province (Papua New Guinea) | Northern Province | Mendoza Province | Guanacaste Province | Province of New York | Fars Province | Boulgou Province | Province | Manabí Province | El Oro Province | Tigray Province |
The first two digits of the postal code denote the province or special administrative area (e.g. 43120 Phon Phisai, Nong Khai).