When developing applications for the Internet, you may want to include the postal code in your address to avoid invalid results. Postal codes are required in certain countries, but not all. For example, in Canada, Mexico, and Jamaica, a postal code will be used for shipping purposes, while in the U.S., a state-code-plus-zip combination is required. The latter is useful when the postal code varies by region and is useful in different countries.
You can also lookup an address in Ireland or Singapore with a postal code. The Irish postal code is Eircode and is nearly as precise as an address in either country. If you are interested in a specific address in either country, you can use the /geocode endpoint to find details about it. This endpoint supports both qualified and freeform queries. The /geocode endpoint returns a complete address.
Postal codes are a convenient way to refer to a location. However, they can pose challenges and problems when used with other methods. For example, it's best to treat them as numbers rather than strings to avoid potential errors. If you're looking to use a postal code for another purpose, it's best to treat it as one of them, and choose a postcode-to-address api that can return more information than just the address.
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