How many digits is a Danish postal code?

A Danish postnummer is always exactly four digits. Assigned codes run from 1000 to 9990; there is no leading zero, so codes below 1000 are not standard postnummer.

How do the ranges map to regions?

1xxx–2xxx is Copenhagen and its suburbs on Sjælland, 3xxx is North Zealand and Bornholm, 4xxx is the rest of Zealand and the southern islands, 5xxx is Fyn (Funen), and 6xxx–9xxx covers Jylland (Jutland) from south to north.

Where does Bornholm fit?

Bornholm, the island in the Baltic, uses postnummer in the 3700–3799 range (for example 3700 Rønne), even though it is far east of the rest of the country.

Does a valid format mean the postnummer is in use?

No. This tool checks the four-digit format and the broad range only. A well-formed code can still be unassigned, so confirm against PostNord's official register if delivery accuracy matters.

Is my postal code sent anywhere?

No. Validation and the lookup run entirely in your browser. Nothing leaves your device.

Denmark Postnummer Validator

A Danish postnummer is the 4-digit postal code used to route mail and parcels across Denmark. Unlike many countries, Danish codes never begin with a zero — they run from 1000 (central Copenhagen) up to 9990 (northern Jylland). Because the codes increase geographically from east to west, the leading digit is a strong signal of region. This free tool validates the format and maps the code to its region in your browser.

How it works

Strip whitespace; the input must be exactly four digits.
Reject any value below 1000, since Danish postnummer do not use a leading zero.
Match the numeric value against the assigned range table to find the region:
- 1xxx–2xxx → Copenhagen and Sjælland,
- 3xxx → North Zealand and Bornholm,
- 4xxx → South/West Zealand and the southern islands,
- 5xxx → Fyn,
- 6xxx–9xxx → Jylland.

Example

Validate 2100 (København Ø): four digits, 2xxx → greater Copenhagen, Sjælland. Validate 5000 (Odense): 5xxx → Fyn. Validate 8000 (Aarhus): 8xxx → East Jylland.

Notes

The region mapping is a heuristic based on leading-digit ranges, so it returns the broad area rather than the exact post town. A valid four-digit format does not guarantee the specific code is assigned, and a few special codes (large recipients, PO-box ranges) sit inside otherwise geographic blocks. Confirm against PostNord’s official register when delivery accuracy matters. Everything runs locally in your browser.