What is ZIP+4: It is a basic five-digit code with four digits added as an extra identifier.
How to find your ZIP+4: Use Melissa's address check tool to verify an address and find your ZIP+4.

Your ZIP+4 is a basic five-digit code with four digits added as an extra identifier. It helps to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, or a post office box. ZIP+4 Codes improve the mail sorting and delivery process - the increased level of accuracy helps speed up delivery time, decrease the chance of delivery errors, and qualify mailers for bulk mailing discounts.

Melissa’s ZIP+4 lookup returns a list of addresses within the provided ZIP Code. It also returns information related to addresses such as current resident, phone number and more. To use the lookup tool, simply

  • Enter a 5-digit ZIP Code and see a list of all ZIP+4 Codes within the given 5-digit ZIP Code.
  • Enter a ZIP+4 Code and get all addresses within that ZIP Code and other consumer records.

Why Melissa?

Melissa has over 35 years of experience providing leading-edge address management and mailing solutions. Our Address Verification service CASS processes your mailing list by matching the addresses in your mail file to the monthly updated USPS® National Address file, adding the correct ZIP+4 postal codes and standardizing to meet USPS CASS requirements. We verify, correct and standardize address data for over 240 countries, and our CASS processing service can help you improve mail deliverability and qualify your mailings for postal discounts.

250+ Countries & Territories
1,000,555,787+ Addresses Verified
35+ Years
10,000+ Customers Worldwide