Sweden postnummer validator
How the postnummer format works
- Format
- 5 digits
- Example
- 11157
Things to watch for
- Format-only check — does not confirm the postnummer actually exists
- 5 digits total; normally written with a space after the first 3 digits (e.g. 111 57)
^[0-9]{5}$A Swedish postnummer is the 5-digit postcode PostNord uses to route mail, conventionally written with a space after the third digit — for example 111 57 for central Stockholm. Anyone validating a Swedish shipping address, a checkout form, or a database of customer records needs the postnummer to at least be the right length and shape before it’s used downstream.
Because a postnummer is a plain run of digits with only a space (no letter or hyphen) to anchor against, a dropped or transposed digit is easy to miss visually while still looking entirely plausible. Catching that at the point of entry is cheaper than a parcel misrouted to the wrong sorting district.
How this validator works
This tool checks that the input is exactly 5 digits, accepted with or without the customary space after the third digit, entirely in your browser, with nothing sent to a server.
What a pass doesn’t tell you
A postnummer carries no check digit, so a correctly shaped 5-digit string is the most a client-side tool can confirm — not that PostNord has assigned it to a real town, street, or delivery office. Confirming that requires PostNord’s own postcode lookup.
Scope: this page and tool cover format validation only — not address lookup, district matching, or confirming a postnummer is currently in use.
postnummer FAQ
Does the first digit of a postnummer mean anything?
Yes, broadly. PostNord assigned Sweden's postnummer ranges so that the leading digit roughly tracks geography, with the Stockholm area anchoring the low end of the range and the numbering sweeping outward across the rest of the country. It's a coarse routing hint, not a precise map reference.
Do I need to type the space in the middle?
No — this validator accepts the postnummer with or without the customary space after the third digit (e.g. '11157' or '111 57'). The space is a writing convention; the underlying code is still 5 digits.
Does a correctly formatted postnummer mean it actually exists?
No. This tool only confirms the string is 5 digits in the right shape — it doesn't check it against PostNord's actual assignment list. Confirming a postnummer is real, and seeing which town or district it covers, requires PostNord's own postcode lookup.