A ZIP Code is an essential part of the mailing process. We provide your business with several different ways to find a ZIP Code and understand it.

Our database of 45 million 9-digit ZIP+4 Codes is organized into separate websites for each of the 50 states and the District of Columbia. You can find more information such as ZIP Codes, ZIP+4 Codes, …

A ZIP+4 Code is a 4-digit code appended to a standard 5-digit ZIP that helps the USPS sort, route, and deliver mail more efficiently. The last 4 digits of these 9-digit ZIP Codes usually represent 6-20 …

This is what an address looks like with the ZIP +4 Code: The first five digits identify the area of the country and the delivery office to which the mail is directed.

Each ZIP+4 code comprises a 9-digit code; the first 5 digits represent the standard ZIP code, and the last 4 digits identify a specific geographic location or group of addresses.

Clear, up-to-date guide to ZIP+4 format: what the 9-digit code means, when it helps, and how to look up the correct ZIP+4 for any address.

A free address verification and Zip+4 lookup tool. Just enter your info to get a USPS standardized USPS ZIP+4 with county name, FIPs and more.

A standard five-digit ZIP code identifies the local delivery area, and ZIP+4 (ZIP 4) adds four digits that target precise locations like a city block, a specific building, or PO Boxes.

Our address validation software is able to retrieve the ZIP code of an address based on the Street name and number, City, and State information. If you don't have the ZIP code information for an otherwise …

Look up and find the ZIP+4 for a single address — or thousands or millions of addresses all at once