First Log into your USPS.com account, then click Print Shipping Label
On this screen on the right hand side under Manage My Shipping, click on Address Book
Here you can see the alphabetical listing of all your stored addresses - US and International
You can even create groups here - have a recurring shipping group - create one for easy one click label creation.
You can Add Contact, Import or Export. Instruction on how to do each are listed on the site.