The longest road solely in America is U.S. 20, which runs from Boston, Massachusettes, to Newport, Oregon. It spans a total 3,365 miles. However, the Pan-American highway runs from Alaska, through the U.S. and down to South America, spanning a length of 29,800 miles. So that could also be considered the longest road in America, though most of its length is in other countries.
Route 20 is the longest road in the US. It is 3,365 miles long and goes from Boston to Newport, OR.
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