Tennessee State Route 166

State Route 166
SR 166 highlighted in red
Route information
Maintained by TDOT
Length51.60 mi (83.04 km)
Major junctions
South end SR 127 at the Alabama state line in Bethel
Major intersections
North end US 412 in Hampshire
Location
CountryUnited States
StateTennessee
CountiesGiles, Maury
Highway system
SR 165 SR 167

State Route 166 (SR 166) is a north–south state highway in southern Middle Tennessee, traversing Giles and Maury counties.