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Address the letter to:

Santa Claus, North Pole, H0H 0H0, Canada

Make sure to include your return address, and Canada Post will make sure Santa's response gets back to you.

https://www.canadapost.ca/cpo/mc/personal/campaigns/holiday/...

Will this work for letters from the US?

I think so, but I'm not sure. The website says: For our friends writing from outside Canada, please note that we are unable to guarantee delivery times outside Canada. We will do our best to ensure replies are sent in a timely manner. Letters mailed from outside of Canada require postage.

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