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- Stamps.com - Provides postage stamps for letters, packages & priority mail.
http://www.stamps.com
- USPS - Offers stamp purchase, rate information, electronic bill payment, forms, and general shipping information.
https://www.usps.com/
- USPS: Look Up a ZIP Code - Offers ZIP+4 code(s) for a city and all cities across the United States in a ZIP Code.
https://tools.usps.com/go/ZipLookupAction!input.action
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