How to Say "What Is Your Zip Code?" in Spanish

¿cuál es tu código postal?

The English phrase "what is your zip code?" is translated into Spanish as ¿cuál es tu código postal?

This phrase is a question used to request the series of numbers that identify a specific delivery area for mail.

How does it change in a sentence?

The question uses the interrogative pronoun cuál (which) rather than qué (what) because it is choosing from a set of possible codes.

The word código shares an ancestor with the English word 'code', but it also traces back to the Latin word 'caudex', which originally meant 'tree trunk' or 'block of wood'.
In many Spanish-speaking countries, you will find that people often provide their neighborhood name or a nearby landmark instead of a código postal because these codes are not used as strictly as in the US.
While 'zip code' is a specific Americanism, the Spanish term postal refers to the 'posta', which was a system of relay stations for horses used to carry mail across long distances.

Daniel is filling out a form for María.

Sources

⭐Share⭐ to appreciate human effort 🙏