|Length||85.0 km (52.8 mi)|
|South end||near Pittsburg, NH|
| at Weedon|
|North end||in Saint-Adrien|
|Major cities||Weedon, Scotstown|
Route 257 is a north-south highway on the south shore of the St. Lawrence River, in the Eastern Townships region of Quebec, Canada. Its northern terminus is in Saint-Adrien at a junction with Route 216, and its southern terminus is at the Pittsburg-Chartierville Border Crossing, where it becomes U.S. Route 3 as it enters Pittsburg, New Hampshire.
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