- USPS - ZIP Code Lookup
Look up a zip code by address, city and State.
http://zip4.usps.com/zip4/welcome.jsp
- Security Manufacturing Corp
Manufacturer of commercial, USPS approved metal mail boxes. Located in Grapevine, Texas.
http://securitymanufacturing.com
- Mover's Guide
Postal Service moving guide includes a post office locator, zip code lookup and change-of-address information.
https://moversguide.usps.com
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