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, …

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 …

The last two digits identify the post office or delivery area within that region. In addition to the five-digit ZIP code, there are also ZIP+4 codes, which include an additional four digits that further …

ZIP+4 Code Look-up Enter an address. If found, the standardized address and ZIP+4 Code will be returned.

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.

US Postal Code Lookup Find the full ZIP + 4® Code of a US Address.

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.

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