This week marks the earliest kickoff ever for the 111-year-old program.
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It helps ensure children's letters to Santa make it to elves and human helpers who assist with gifts.
To participate, kids need to use their full name, a return address, a stamp and Santa's correct address.
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The postal service says it's 123 Elf Road, North Pole, 88888.
If you want to help Santa and his elves with a child's letter, check out the USPS website.
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