 State Route 166 | ||||
|---|---|---|---|---|
| Route information | ||||
| Maintained by TDOT | ||||
| Length | 51.60 mi (83.04 km) | |||
| Major junctions | ||||
| South end |  SR 127 at the Alabama state line in Bethel | |||
| North end |  US 412 in Hampshire | |||
| Location | ||||
| Country | United States | |||
| State | Tennessee | |||
| Counties | Giles, Maury | |||
| Highway system | ||||
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State Route 166 (SR 166) is a north–south state highway in southern Middle Tennessee, traversing Giles and Maury counties.