ZIP+4 Code Lookup, Get Last 4 Digits of 9-Digit ZIP Codes

Find ZIP+4 Codes™ for any USPS® address. Lookup ZIP+4 Codes™ by single address, batch or API. Learn what they are and what they mean too. Use it free.

ZIP+4 Code™ Lookup Tool & Extra 4 Digits of ZIP Codes Explained

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