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![USPS address verification webpage](/img/articles/usps-address-verification-web-page-448px.webp)
Learn how to verify and standardize addresses with USPS, understand its limitations and see better options.
![ZIP+4 Code example and explanation that shows that last 4 digits of these 9-digit ZIP Codes usually represent a specific street, large building, side of the street, or floor of a large building.](/img/articles/zip-4-codes-index-658.webp)
ZIP+4 Codes are the last 4 digits of a nine-digit ZIP Code. A nine-digit ZIP Code is made of two parts.
![County FIPS Codes](/img/articles/county-fips-codes-1120px.webp)
How to lookup county FIPS Codes by address, ZIP Code and city. County FIPS Codes are 5-digit numbers that identify each county in the United States.
![Government services benefit from address data intelligence](/img/articles/government-benefiting-from-address-data-448-336.webp)
With millions of addresses in the US alone, it can be a pain to ensure that your database is accurate. See how Smarty ensures accuracy for the city of Miami.
![Mail in a door found using address line 1](/img/articles/mail-in-door-found-using-address-line-1-448-336.webp)
Address Line 1 contains house numbers, street names, and suffixes, among other data points. We've compiled all you need to know here, check it out now!
![Google Address Validation API Sample Output](/img/articles/google-address-validation-api-output-448-336.webp)
Check out how Google's address validation API stacks up against Smarty's legendary and lightning-fast address validation API. We have all you need here!
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