New Mexico State Road 166

State Road 166
NM 166 highlighted in red
Route information
Maintained by NMDOT
Length	1.9 mi[1] (3.1 km)
Major junctions
West end	End of route near Datil
East end	NM 52 near Datil
Location
Country	United States
State	New Mexico
Counties	Socorro
Highway system
New Mexico State Highway System Interstate US State Scenic
← NM 165 → NM 167

State Road 166 (NM 166) is a 1.9-mile-long (3.1 km) state highway in Socorro County, New Mexico, United States. NM 166's western terminus is at the end of route east-southeast of Datil, and the eastern terminus is at NM 52 east-southeast of Datil. It runs along a portion of a former alignment of U.S. Route 60 and serves the visitor center of the Very Large Array astronomical observatory.