Overview

The postal code systems of Switzerland and Liechtenstein use a four‑digit numeric scheme administered through the Swiss postal network. Codes are allocated geographically so that nearby places have related numbers, helping to route mail efficiently across both countries. Liechtenstein participates in this system and is served by Swiss postal infrastructure.

Format and addressing

Each postal code consists of four digits and normally appears on the address line immediately before the locality name. In multilingual contexts the abbreviation for postal code varies by language; for example, the German abbreviation PLZ is commonly used. A typical address line will show the four‑digit code followed by the town or village name.

Organization and regional allocation

Numbers are grouped so that particular blocks correspond broadly to regions, municipalities or larger urban centres. This regional structure aids sorting at distribution centres and allows postal operators to assign special codes to delivery offices, large organisations, or PO boxes when necessary. The system is maintained centrally to reflect administrative changes and new delivery needs.

History and relationship between the two countries

The four‑digit scheme was introduced in the mid‑20th century as postal services modernized and mechanized. Since Liechtenstein does not operate an independent nationwide postal numbering plan of comparable size, its localities are integrated into the Swiss scheme and its mail is handled in partnership with Swiss Post.

Uses and practical examples

  • Mail and parcel routing: codes speed automated sorting and delivery.
  • Navigation and e‑commerce: online forms, shipping labels and address validation rely on the code.
  • Statistics and planning: planners and businesses use postal codes for demographic and logistic analysis.

For address checks and the official list of codes consult the postal code directory or search tool provided by the postal authority: postal code search. General information about Switzerland and its postal arrangements is available at Switzerland, and specific guidance for Liechtenstein at Liechtenstein.