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. There are no junctions with any other state highways along SR-257.

Quick Facts State Route 257, Route information ...

State Route 257
Route information
Maintained by UDOT
Length	69.246 mi[1] (111.441 km)
Existed	1955–present
Major junctions
South end	SR-21 in Milford
North end	US 6 / US 50 in Hinckley
Location
Country	United States
State	Utah
Highway system
Utah State Highway System Interstate US State Minor Scenic
← SR-256 → SR-258

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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.^[2] The remainder was not created until 1955, when the state legislature added the road between SR-21 in Milford and SR-140 at Deseret to the state highway system as SR-257.^[3] A short loop through downtown Hinckley, heading west from SR-140 on 2500 South and north on Main Street to SR-27, was added as State Route 240 in 1966 but dropped from the state highway system in 1969.^[4] With the deletion of SR-140 in 1969, SR-257 assumed its current extent, replacing the north–south piece of SR-140.^[5]