Form question (adding postal codes and cities)

For which country?

You can find everything on Google. Nothing is impossible when Google is alive. Try to search again or provide a detailed question so that you get a detailed answer.

Thanks

Sorry, I would like to integrate a search button in my website for postal codes of the Netherlands. Preferably in the sidebar.

postcode database for the Netherlands

Ok, thank you Rich, but isn’t there a way to get some sort of code I could use because I think I have to pay for this information.

generally you do have to pay, you’ll have to improve your Google-fu to find a free version.