Postal codes in Denmark are determined by a four digit system that was implemented 1967. The only exceptions are five special purpose 3-digit codes. The self-governed territory of Greenland is part of the Danish system (39xx) while the Faroe Islands nowadays has its own 3-digit codes. Historically, the Faroe Islands had 38xx as postal code. New regulations add the country code DK to the postal codes, but in practice it is most often omitted. The code is written before the city name. Examples:1000 København C (Copenhagen City)6100 HaderslevDK-9000 Aalborg or in Danish