The list of Netflix Distribution Centers on the Wikipedia is under consideration for deletion. If you want the Wikipedia to host this information you can vote "Do not delete." I would host the information here but I'm worried that a "fake" PO Box will be submitted and someone will steal a bunch of movies.
The best thing you can do if you want to send all movies back to your local shipping center is to copy the address on your Netflix envelopes every few weeks (they do change from time to time).
via Chris and the Netflix Fan Blog