New Hampshire Route 145 (abbreviated NH 145) is a 13.12 miles (21.1 km) long north–south state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 in Coos County

Coos County, New Hampshire

-National protected areas:*Umbagog National Wildlife Refuge *Silvio O. Conte National Fish and Wildlife Refuge *White Mountain National Forest -Demographics:...

 in northern New Hampshire

New Hampshire

New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...

. The highway runs between Colebrook

Colebrook, New Hampshire

Colebrook is a town in Coos County, New Hampshire, United States. The population was 2,301 at the 2010 census. Situated in the Great North Woods Region, it is bounded on the west by the Connecticut River and home to Beaver Brook Falls Natural Area....

 and Pittsburg

Pittsburg, New Hampshire

Pittsburg is a town in Coos County, New Hampshire, United States. The population was 869 at the 2010 census. It is the northernmost town in New Hampshire and the largest town by area in the state - and in New England as well - more than twice the size of the next largest town, Lincoln. U.S...

, paralleling U.S. Route 3 for its entire length.

The southern terminus of NH 145 is at U.S. Route 3 in Colebrook on the Vermont

Vermont

Vermont is a state in the New England region of the northeastern United States of America. The state ranks 43rd in land area, , and 45th in total area. Its population according to the 2010 census, 630,337, is the second smallest in the country, larger only than Wyoming. It is the only New England...

 border. The highway passes through the towns of Stewartstown

Stewartstown, New Hampshire

Stewartstown is a town in Coos County, New Hampshire, United States. The population was 1,004 at the 2010 census. It includes the village of West Stewartstown and is part of the Berlin, NH–VT Micropolitan Statistical Area.-History:...

 and Clarksville

Clarksville, New Hampshire

Clarksville is a town located in northern Coos County, New Hampshire, United States. The population was 265 at the 2010 census. It is part of the Berlin, NH–VT Micropolitan Statistical Area.- History :...

. The northern terminus of NH 145 is in Pittsburg at US 3, just after crossing the Connecticut River

Connecticut River

The Connecticut River is the largest and longest river in New England, and also an American Heritage River. It flows roughly south, starting from the Fourth Connecticut Lake in New Hampshire. After flowing through the remaining Connecticut Lakes and Lake Francis, it defines the border between the...

.