<P> U.S. Route 1 ( US 1 ) is a major north -- south U.S. Highway that serves the East Coast of the United States . It runs 2,369 miles ( 3,813 km ) , from Fort Kent , Maine , at the Canada -- US border , south to Key West , Florida , making it the longest north -- south road in the United States . US 1 is generally paralleled by Interstate 95 ( I - 95 ) , though the former is significantly farther west ( inland ) between Jacksonville , Florida , and Petersburg , Virginia . The highway connects most of the major cities of the East Coast -- including Miami , Jacksonville , Richmond , Washington , D.C. , Baltimore , Philadelphia , New York City and Boston , passing from the Southeastern United States to New England . </P>
where does us highway 1 start and end
from Fort Kent , Maine , at the Canada -- US border , south to Key West , Florida