Every year, the U.S. Postal Service produces the National ZIP Code Directory to accommodate the constantly changing geographical make-up of the United States. This 2013 edition contains all the essential information you need to get your mail where it needs to go-including updated information on new residential numbers, new street names, and new ZIP Codes. Published in two comprehensive volumes, the National ZIP Code Directory is designed to be easy to use, accurate, and up-to-date. In addition to ZIP Code listings, Volume 1 contains helpful instructions on how to find ZIP Codes in the Directory and how to properly address your mailings. Volume 2 contains useful information on symbol abbreviations, mail services, classes of mail, and much more.