Postal codes in Switzerland

Structure and format

Each Swiss postal code consists of four digits. For international mail the code is commonly prefixed with the country code, written as "CH-" followed by the four digits (for example CH-8001 Zürich or CH-1000 Lausanne). The digits are assigned so that neighboring areas often share similar leading digits, which helps automated and manual sorting processes.

History and administration

The modern four-digit scheme was introduced to standardize and modernize mail handling and is maintained by the national postal operator, Swiss Post. Codes are periodically adjusted to reflect new delivery needs, urban growth, or changes in postal routing and infrastructure.

Uses and practical examples

Beyond simple mail delivery, postal codes are used for logistics planning, e-commerce address validation, demographic analysis and routing of emergency or municipal services. A typical Swiss address places the postal code before the locality name, for example:
Bahnhofstrasse 1
8001 Zürich

Special cases and notable facts

• Large cities and important institutions may have multiple codes or dedicated codes for post office boxes and large-volume recipients.
• Small municipalities can share a range of codes or use the code of a nearby postal centre.
• The postal code system coexists with Switzerland’s political subdivisions — cantons — but codes are organized for postal efficiency rather than strictly following administrative borders; see a canton index at cantonal lists for local groupings.

For precise lookup of a code, postal office locations, or changes to assignments, consult the national postal operator's official resources or local postal offices.