Swiss postcode 8302 is Kloten, to the north of Zürich (the CH is just the abbreviatiion for Switzerland). Kloten is the location of Zürich airport.
If you mean the international car registration then it is Switzerland
Switzerland is distinguished by putting an CH (Confoederatio Helvetica) on parcels, etc... but, of course, every - even small villages - district in Switzerland has its own postal code. Examples: Berne (capital): CH-3000 and others variing around 3000... Zurich (biggest city): CH-8000 and others... Meiringen (village, where - according to the books - Sherlock Holmes and Moriarty died - has about 5000 inhabitants): CH-3860... - did you get the idea? According to the code, Meiringen has to be close to Berne... and yes, it's part of the same canton (district or better state).
CH is the abbreviation of Switzerland's official name Confederatio Helvetica.
Switzerland - official name: CH, confoederatio helvetica
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Cars in Switzerland have "CH" on them because "CH" is the country code. It stands for "Confoederatio Helvetica", or "Swiss Confederation".
The two-letter country code "CH" represents Switzerland.
CH is the international badge for Switzerland, or Helvetia.