State Route 257 is a highway in central Utah that runs from the junction of SR-21 in Milford to US-6/US-50 sixty-nine miles (111 kilometers) to the north in Hinckley.

From its southern terminus in Beaver County, SR-257 generally north until Black Rock, where it makes a turn to the northwest.

It stays north-northwest until the northern terminus of the route, located in Millard County.

Most of the route is paralleled by Lynndyl Subdivision of the Union Pacific Railroad.

[citation needed] The northernmost piece of SR-257 became a state highway in 1933 as part of State Route 140, a short connection from SR-27 (now US-6) near Hinckley south to Deseret and east via Oasis to SR-26 (now US-50) at Harding.