NEED URGENT INVITE HELP

So FH and I are at my FIL's addressing envelopes on the computer. (GRRRRR... long story involving very frustrating problems with our own). So I don't have my etiquette books with me. Which one is correct?

Mr. and Mrs. Joseph Smith
44 2nd Street
Ronkonkoma, New York 11779

or

44 Second Street

Thanks girls.

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Posted by jpavig

The first one. 44 2nd Street.

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I believe that is the correct way

Thanks girls

Actually, I believe both are correct:

'Street Names that are numbers can be written two ways - 94 East 4th Street or 94 East Fourth Street. Unless your envelopes are unusually large, it is a good idea to not exceed 5 lines in your address as they tend to start looking a bit messy with any additional lines. '