. US 3 highway was formed in the year 1926. It has a length of 278 miles.
. US Route 3 is a north-south United States highway.
. US 3 highway passes from Massachusetts (242 miles), and New Hampshire (36 miles) which comes to 278 miles.
. It runs from southern terminus which is Cambridge, Massachusetts through New Hampshire to its terminus near Third Connecticut Lake at the Canadian Border,where the road continues north as Quebec Route 257.