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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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