Postal codes in Denmark are determined by a four digit system that was introduced in 1967.^[1] The only exceptions are five special purpose 3-digit codes.

The self-governing territory of Greenland is part of the Danish system (39xx).^[2] Historically, the Faroe Islands also formed part of the Danish postal code system using the 38xx range and the prefix "FR", but this was changed to a new format consisting of a three-digit code and the country code "FO", with FR 3800 Tórshavn becoming FO-110 Tórshavn.^[3]

The code is written before the city name. For example:

• 1000 København C
• 6100 Haderslev
• DK-9000 Aalborg

New regulations add the country code DK to the postal codes,^{[citation needed]} but in practice it is most often omitted. DK or Denmark must be used when mailed from abroad.

Ministry of Foreign Affairs of Denmark
Asiatisk Plads 2
1448 Copenhagen K

Or in Danish:

Udenrigsministeriet
Asiatisk Plads 2
1448 København K

The postal codes follow a geographic pattern and most Danes can tell which region an address belongs to based on the postal code alone.

• 0000–0999: special postal codes, reserved for government use, post offices and package centers
• 1000–2999: Copenhagen and the surrounding area
• 3000–3699: North Zealand
• 3700–3799: Bornholm
• 3800–3899: formerly used for the Faroe Islands, no longer in use.
• 3900–3999: Greenland
• 4000–4999: Zealand (excluding North Zealand and the capital region), Lolland-Falster, and Møn
• 5000–5999: Funen and its surrounding islands
• 6000–9999: Jutland