Fast, easy address verification

Free postal address validation and geocoding

Address verification is our passion. It's what we do. You take care of your customers and we'll take care of your addresses.

  • Instant CASS-Certified results
  • Geocode with latitude & longitude
  • No contracts, fees, or minimums
  • Personalized support from real people
  • No software to install — try the demo now


Trusted by:

What is address verification?

Address verification, or address validation, is used to determine the deliverability of a specific address. During the address verification process, addresses are cleaned and standardized according to USPS guidelines. Spelling mistakes are corrected, and the standard 5-digit ZIP Code is expanded to the more precise ZIP+4 Code. This process can be used to qualify for discounts on bulk mailings and to ensure timely delivery of e-commerce shipments.

Upload a list of addresses to validate
Add address verification to your website, app, or software

How to get mailing discounts

Address verification must be performed for every letter, package, or parcel handled by the US Postal Service. If you verify the addresses before mailing, you may be eligible for a mailing discount because it saves the post office time and money.

But in order to get the discount, the address verification service that you use must be CASS-Certified by the USPS. Our CASS-Certified address verification service will provide you with the CASS Summary Report (PS 3553) that you need to present with your mailing to qualify for any discounts. Simply present it with your mailing, and talk to your local postmaster to fill out any necessary forms.

Address verification pricing

At SmartyStreets, there is no minimum purchase price and no long-term contracts. You can use our address verification service for a single address or billions of addresses, and we even have an unlimited plan so you don't have to keep count. Our pricing is affordable for everyone and is right on our website, so there's no haggling with a salesman.

You'll get a free, 42-record preview of every list you upload, and our API is free for the first 250 address lookups per month. Plus, if you're a non-profit or school, we won't charge you a dime for unlimited service.

How fast is it?

Buckle up. The engine that powers our address verification service is so fast you can have the results back to you in less than a second. Seriously, it's that fast.

Lists containing tens of thousands of addresses are finished in under a minute. Larger lists with millions of addresses will be back to you in about an hour. Try it for yourself! In most cases, your cleaned and verified address list will be ready before you are.

Get started in seconds