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Postcodes in Poland are much less granular than the UK ones, but you can still get by in more rural areas on the assumption of local postmen knowing the people. My parents used to routinely successfully receive letters addressed just

where the town has circa 3K inhabitants.

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Many people don't realize that in the USA, the letters only get sorted by postal zip code (and sometimes zip+4) - everything else is sorted by the postman as he walks the streets, so if your letter gets to the right post office it will likely get to the right postman and he can often figure it out without it even having to go to the dead letter office.

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