Here in the US, the Postal Service does not require the Apartment number to be separated from the street address, and it also does not require comma's between the entries for the City State Zip Code.
US Postal Service Addressing Tips
At the bottom of the link you can see examples of their guidelines.
I don't use periods after abbreviations like St or Ave and I don't use a comma to separate the Apartment number from the street address ie: 1033 Oakmont Dr Apt 76
The apartment information does not affect the Map It function in Apple's Address Book application.
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Proper Way to Add Apartment Information?
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