Highway 621 is a highway

Highway

A highway is any public road. In American English, the term is common and almost always designates major roads. In British English, the term designates any road open to the public. Any interconnected set of highways can be variously referred to as a "highway system", a "highway network", or a...

 in the Canadian

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 province of Saskatchewan

Saskatchewan

Saskatchewan is a prairie province in Canada, which has an area of . Saskatchewan is bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, and on the south by the U.S. states of Montana and North Dakota....

. It is in two segments. The southern segment runs from Highway 13

Saskatchewan Highway 13

Highway 13 is a highway in the Canadian province of Saskatchewan. It runs from the Alberta border until it transitions into Highway 2 at the Manitoba border near Antler. Highway 13 is about 676 km long.Highway 13 passes through Shaunavon, Assiniboia, Weyburn, Redvers and Carlyle...

 to Highway 306

Saskatchewan Highway 306

Highway 306 is a highway in the Canadian province of Saskatchewan. It runs from Highway 6 to Highway 35. Highway 306 is about 67 km long....

 near Lewvan, and the northern segment runs from Highway 33

Saskatchewan Highway 33

Highway 33 is a highway in the southern portion of the Canadian province of Saskatchewan connecting the Stoughton to the capital city of Regina This paved highway is divided near Regina.-Communities:...

 near Lajord to Highway 48

Saskatchewan Highway 48

Highway 48 is a highway in the Canadian province of Saskatchewan. It runs from Highway 1 near White City until the Manitoba–Saskatchewan border, where it becomes Provincial Road 257. Highway 48 is about 239 km long....

. The southern segment is about 44 km (27 mi.) long and the northern segment is about 18 km (11 mi.) long.

The southern segment has a 2-km concurrency

Concurrency (road)

A concurrency, overlap, or coincidence in a road network is an instance of one physical road bearing two or more different highway, motorway, or other route numbers...

 with Highway 39

Saskatchewan Highway 39

Highway 39 is a provincial paved undivided highway located in the southern portion of the Canadian province of Saskatchewan connecting North Portal and Moose Jaw in the north. This is a primary Saskatchewan highway maintained by the provincial and national governments providing a major trucking...

 near Yellow Grass

Yellow Grass, Saskatchewan

Yellow Grass is a town in southern Saskatchewan, Canada at . It is located 30 km northwest of Weyburn, at the junction of provincial highways 39 and 621. The town is located on the Canadian Pacific Railway Soo Line...

.