Mammoth Road is a north–south road in Massachusetts and New Hampshire. The road runs from its origin in Lowell, Massachusetts to its northern end in Hooksett, New Hampshire, a suburb of Manchester. The total length of the road is 29.3 miles (47.2 km). It was named "Mammoth" in the hope that the convenience of its directness and elimination of smaller connecting roads between thoroughfares would result in sufficient use and prestige as to "kill all the other roads".