Why the distinction actually matters
The fastest way to grasp the difference is to look at three completely different realities. 8001 Zurich is a clean postcode: it maps to one locality, one municipality, and gives you one perfectly reliable tax read. 1008 Prilly is a mess: the postcode is split exactly 50/50 between Prilly and Jouxtens-MĂ©zery. 3011 Bern and 3004 Bern show the exact opposite pattern: two different postcodes that funnel into the exact same administrative municipality.
That is the golden rule you need to remember. Postcodes exist to route physical mail. Municipalities exist to run your life. Taxes, schools, building permits, and public services strictly follow the municipality boundary, not the four-digit number on your envelope.
The moment you blur those lines, you start expecting a postcode to guarantee things it simply cannot deliver.
How we handle postcode splits
We explicitly show the municipal breakdown so you can immediately see whether a postcode is a clean single-municipality read or a mixed-up border zone. 6052 Hergiswil NW is technically split, but let's be real: it is 99.801% Hergiswil and a microscopic 0.199% Horw. 1040 Echallens is entirely different, splintering across three different municipalities at roughly a third each.
That split fundamentally changes how you should read the page. Hergiswil is essentially a direct municipal proxy. Echallens is absolutely not. The data on both pages is correct, but you have to trust them differently.
This data is excellent for shortlisting and broad comparisons. But is it enough to sign a lease or finalize a tax strategy? No.
What you must verify before acting
If you are running tax comparisons, planning a move, or scrutinizing a specific property, you have to confirm the official municipality first. Once you have that, use the official canton tax calculator and check the local municipal rules. That specific administrative reality matters infinitely more than the postal name on the mailbox.
