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USPS Site Search		Home > Grow Your Business > Address Quality > ZIP Code Lookup and Address Information
Get New Customers Keep Your Customers Save Time & Money Business Mail 101   Address Quality   ZIP Code Lookup and Address Information   ZIP Code Lookup   ZIP Code FAQs   ZIP Code Directories   USPS Abbreviations   Address Management System Office Locator Business Tools		The ZIP Code system is extremely important in the processing and delivery of mail. An envelope that does not include a ZIP Code in the delivery address must be manually sorted, which increases the cost of sorting the mail and causes mail to be delayed en route to the delivery address. Use the online ZIP Code Lookup to find a ZIP Code. Publication 65, National Five-Digit ZIP Code and Post Office Directory, and the ZIP+4® State Directory on CD ROM are available for purchase by calling the National Customer Support Center (NCSC) at 1-800-238-3150. ZIP Code Lookup - Locate a specific ZIP Code number, all ZIP Code numbers in a city or all cities in a ZIP Code. ZIP Code FAQs - Frequently asked questions regarding ZIP Code numbers. ZIP Code Directories - Obtain a hardcopy of the National Five Digit ZIP Code and Post Office™ Directory or the ZIP+4 State Directory on CD ROM. USPS® Abbreviations - A list of USPS address elements and their abbreviations. Address Management System (AMS) Office Locator - Locate any AMS Office in the nation.

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