How to draw a map of postal codes of a country?

المشرف العام

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I have data:

postal codevalue
00-002 50
00-003 70
...
99-440 510


where postal code is a postal code in Poland, and value is a number (it can be number of people, density, temperature etc.).
I want to create a map for this data. So I need a map with areas coloured depending of a value. Something like this here. So such data exists somewhere.

  • How can I get data that I can use to draw the map of Poland divided into areas with their postal code? Where can I find it?
  • What software can I use to do this?
  • If this is not a proper place for such question, where can I ask?

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