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.

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 …

Enter a full mailing address to get the correct 9-digit ZIP+4 code and USPS-standardized address format. Free tool powered by official USPS data.

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, …

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 …

Find the ZIP Codes for a city or town or the location of a given ZIP Code on our City/State/ZIP Code Associations page.

It is also common for each PO Box number to correspond to a unique ZIP+4 code. Sometimes, several PO Box numbers are grouped into the same ZIP+4 code by using the last several …

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

Enter a street address along with city and state OR enter a street address and ZIP Code ™. A ZIP Code ™ result does not confirm that a person or company is at that 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.