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Make sure your mail gets to its destination. With each tool, up to five lookups can be processed per request.
Note: Access to these tools requires special permission. Request permission to access Address Information APIs.
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Address Standardization
Eliminate addressing errors and help ensure accurate and timely delivery. This Web Tool corrects errors in street addresses, including abbreviations and missing information. It also supplies a ZIP+4 CodeĀ®.
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ZIP Code™ Lookup
Find matching ZIP Codes or ZIP+4 Code for any given address, city, and state in the U.S.
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City/State Lookup
Get accurate city and state information when you only have the ZIP Code.
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Technical Guides
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Download instructional guides to learn more.
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Service Providers
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Need assistance with integrating? Use a service provider.
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Access Web Tools
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Register now to begin using the USPS Web Tools.
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