ANSWERS: 6
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The longest road in the United States was once the second longest: U.S. 20 from Boston, Massachusetts, to Newport, Oregon!
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I think it used to be route 66
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Its US Route 20 at 3,365 miles. Source: Wikipedia, the free encylopedia.
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US 20, From Boston, MA, to Newport Or.
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The longest INTERSTATE is I-90 from Seattle to Boston at 2090 miles. Source: Federal Highway Administration website.
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route 66
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