Mail 32

You're referring to the postal service!

In the United States, the United States Postal Service (USPS) uses a system of zip codes to help sort and deliver mail. The first digit of a zip code, also known as the "zone", indicates the region of the country where the mail is being sent.

The number 32 corresponds to the zone "3", which covers the states of:

So, if you're sending mail to someone in one of these states, you would use a zip code that starts with the number 32.