What is the format of a Polish postal code?

A Polish kod pocztowy is five digits written as NN-NNN, with a hyphen after the second digit — for example 00-001 for central Warsaw. The hyphen is part of the standard written form.

How does the prefix map to a region?

The first two digits identify a postal routing district. 0x is the Warsaw area (Mazowieckie), 3x is around Kraków (Małopolskie), 4x is Śląskie, 5x is Dolnośląskie, 6x is Wielkopolskie, 8x is Pomorskie, and 9x is Łódzkie, with neighbouring digits filling in the rest.

Why is the voivodeship only approximate?

Postal districts follow sorting routes rather than exact administrative borders, so a town close to a voivodeship line can carry a prefix that belongs to the neighbouring region. Treat the mapping as a strong hint.

Does a valid format mean the code is in use?

No. This tool checks the NN-NNN format and prefix only. A well-formed code can still be unassigned, so confirm against Poczta Polska's official directory if delivery accuracy matters.

Is my postal code sent anywhere?

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

Poland Postal Code Validator

A Polish kod pocztowy is the five-digit postal code used to route mail and parcels across Poland, always written in the NN-NNN form with a hyphen after the second digit. The leading two digits identify a postal routing district that broadly corresponds to a voivodeship. This free tool validates the format and maps the prefix to a region in your browser, and it inserts the hyphen for you as you type.

How it works

Strip non-digits and reformat what you type into NN-NNN.
Require the final value to match the pattern NN-NNN exactly (two digits, hyphen, three digits).
Read the two-digit prefix and map it to a routing district / voivodeship:
- 00–09 → Mazowieckie (Warsaw),
- 30–34 → Małopolskie (Kraków),
- 40–47 → Śląskie,
- 80–84 → Pomorskie (Gdańsk).

Example

Validate 00-001 (central Warsaw): matches NN-NNN, prefix 00 → Mazowieckie. Validate 30-001 (Kraków): prefix 30 → Małopolskie. Validate 80-001 (Gdańsk): prefix 80 → Pomorskie.

Notes

The voivodeship mapping is a heuristic based on the two-digit prefix, so it returns the routing district rather than the exact municipality and is approximate near regional borders. A valid NN-NNN format does not guarantee the specific code is assigned. Confirm against Poczta Polska’s official directory when delivery accuracy matters. Everything runs locally in your browser.