New Hampshire Route 10

New Hampshire Route 10
Map of New Hampshire with NH 10 highlighted in red (this includes the section cosigned along US 302)
Route information
Maintained by NHDOT
Length	122.476 mi[1] (197.106 km)
Existed	1922–present
Major junctions
South end	Route 10 in Northfield, MA
Major intersections	NH 9 / NH 12 / NH 101 in Keene I-89 / US 4 in Lebanon
North end	US 302 in Haverhill
Location
Country	United States
State	New Hampshire
Counties	Cheshire, Sullivan, Grafton
Highway system
New Hampshire Highway System Interstate US State Turnpikes
← NH 9A → NH 10A
← Route 9 N.E. → Route 11

New Hampshire Route 10 is a 122.25-mile-long (196.74 km) north–south state highway in western New Hampshire, United States. Its southern terminus is in Winchester at the Massachusetts state line, where it continues south as Massachusetts Route 10. Administratively, the northern terminus is at a junction with U.S. Route 302 in Haverhill.

In the field, however, NH 10 is cosigned along US 302 for an additional 19.8 miles (31.9 km) from Haverhill to an intersection with New Hampshire Route 18 in Littleton. However, this is not officially part of the route.

NH 10 is a multi-state route along with Massachusetts Route 10 and Connecticut Route 10. Its number is derived from its original 1922 designation as New England Interstate Route 10.