I need help in the proper way for addressing a letter to Italy. Do I address it like this:
Mrs. Albina Verde
56017 Patrignone PI
Via Francesco Rosa 21, Italy
Or is it like we do it in the United States:
Mrs. Albina Verde
21 Via Francesco Rosa
Patrignone PI, Italy 56017
Thank you for your help.

This is to the best of my knowledge, I have sent letters to my Aunt this way with no problem from the US.

Mrs. Albina Verde
Via Francesco Rosa 21
56017-PATRIGNONE PI
ITALIA

or

Mrs. Albina Verde
Via Frencesco Rosa 21
PATRIGNONE PI 56017
ITALIA

had no clue got the post form an Italian on line phone book thank you

Giovanni is right, I've seen more often this one.

Mrs. Albina Verde
Via Frencesco Rosa 21
PATRIGNONE PI 56017
ITALIA

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The first example by Giovanni da Roma is the format I have always used also; sono d'accordo
Maestrodon