Changing format addres for specific country

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I am developing a plugin for a store located in Uruguay. I need to add another field for the shipping address.

When I choose Uruguay as country I get the following fields: address, apartment, postal code and city. I need one more, say "zone" (neighborhood, barrio, something like that).

I see that when I choose Argentina I get the field "province". 

How can I have an extra field for Uruguay.