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This question needs to be more specific. If you're talking about Washington state, it shares a border with Canada and the answer would be less than a mile. If you're talking about Washington, DC, it's a little over 400 miles to the closest Canadian point, but Canada stretches about 3200 miles east to west and about 2900 miles north to south so your mileage may vary.

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10y ago

What else can I help you with?