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Originally every municipality had ist own zip code in Switzerland. Then they started to Group nearby cities and towns together and created a chaos with the zip postcodes. That means, the same postcode is now used for sometimes up to 5 municipalities instead of just letting the original postcodes and mapping them in Computersystems together to the place where the post and packages had to go. I got no clue about what was the Major reason for this but in my opinion they created that way a Major chaos. You will start to think about such things when having more than 3000 towns to put into a database. For Switzeland it just means another fingerwarming homework but imagine USA would do such a chaos with over 60000 towns.
Maybe such things are the reason why Switzerland spent 300 Million Dollars for their IT Systems catastrophy in 2015 what was big in the News.