-- In the dropdown list for "Estado", choose "HIDALGO"
-- In the text box for "Municipio", type "Tlahuelilpan"
-- Click the binoculars where it says "Buscar" (find)
You will get a list of three different postal codes. The one you want probably depends on the section of the city to which you are sending the letter. This might be called the "Colonia" (Col.) or "Fraccionamiento" (Fracc.) in your address. The three postal codes returned are these:
Postal code: 42780
Section: Tlahuelilpan
City: Tlahuelilpan
Postal code: 42789
Section: Munitepec
City: Tlahuelilpan
Postal code: 42790
Section: Cuauhtemoc
City: Tlahuelilpan
If you don't know the correct one to use, I would probably use 42780.
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