 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 | |||
| North end |  US 302 in Haverhill | |||
| Location | ||||
| Country | United States | |||
| State | New Hampshire | |||
| Counties | Cheshire, Sullivan, Grafton | |||
| Highway system | ||||
| ||||
| ||||
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.