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- USPS City State / ZIP Code Associations - search for U.S. ZIP codes by entering city/state, or find cities by entering ZIP codes.
- Singapore Post: Postal Code Enquiry - six-digit enquiry.
- Wikipedia: ZIP Code - hyperlinked article about the history and uses of the United States postal codes. Also includes links.
- National Address Server - enter a partial U.S. postal address and the server attempts to rewrite the address in the proper format along with the ZIP+4 code.
- Australian Post Code Search - search by code or locality.
- Postal Rates.info - direct links to postal authorities, post codes, stamps, and philately around the world.
- USPS Postal Rates - calculate domestic, international, and business postage rates online.
- USPS International Calculator - includes rates for envelopes, packages, and more.
- National Address and ZIP+4 Browser - interactively browse all addresses in the United States.
- Addresses.com: Zip Code Lookup - find zip codes by United States city or state or use the reverse zip code locator.
