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Light-emitting diode, or "LED," holiday lights are the latest way to “deck the halls.” Learn how you can use them to cut your holiday lighting bill by 90% or more.
Compete for cash prizes! Enter the contest that teaches kids and their families about energy, and the benefits of energy efficiency.
Track a package, find Post Offices, look up a ZIP code and many more tools.
More on U.S. Postal Service App >