USPS Verify Address Lookup is a free tool that checks if an address exists in the United States Postal Service database. It returns the standardized format and confirms deliverability.
The tool compares input addresses against the USPS master database. It corrects minor errors like abbreviations or missing set numbers. For example, entering "1600 Pennsylvania Ave NW" returns "1600 PENNSYLVANIA AVE NW WASHINGTON DC 20500-0001".
Many assume the tool can verify addresses outside the U.S., but it only works for domestic addresses. It also doesn't validate whether someone lives at the address-just that the address format is deliverable.
In 2022, the USPS processed 129 billion pieces of mail. Accurate addressing prevents misdelivery and return fees. Businesses use this tool to clean customer databases, while individuals ensure holiday gifts arrive correctly.
I once used it to verify a vendor's address before sending a $5,000 order. The tool caught that the street name was abbreviated incorrectly, preventing potential delays.
The tool doesn't recognize newly constructed buildings until the USPS updates its database. Rural route addresses may return incomplete results. For international addresses, users must contact each country's postal service.
For businesses needing bulk verification, USPS offers paid APIs through its Web Tools program.