To find the 9-digit zip code for your address, you can use the ZIP Code™ Lookup tool on the USPS website. Simply enter your corporate or residential street address, city, and state to see a specific ZIP Code™. If more than one ZIP Code™ matches the information you provided, try finding a ZIP Code™ by Address. Alternatively, you can use a ZIP+4 Code Lookup tool, such as the one provided by Smarty, or the United States ZIP Code 5 Plus 4 website. These tools allow you to enter your full address to get the last 4 digits of your 9-digit ZIP Code. Keep in mind that the last 4 digits of ZIP Codes identify segments of fluid postal delivery routes and can change regularly.