How to receive your green card without an address
At the time of the interview - in case you haven't noticed from the stories before - they will ask you for an address where they will send you the green card.
If you have a friend or relatives you can give their address. If you do not know anybody there is a solution, if you know the city where you want to settle in the beginning.
In order to find the address, go to  the US Post Office website e click on the link 'locate a post office'. After locating a post office, provide this address to the Consulate:
General Delivery
United States Post Office
Town, State, ZIP
Once in the States, go there now and then until the green card arrives. You can use this tip also to receive any kind of mail.