  State Route 100 | ||||
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 SR 100 highlighted; primary in red, secondary in blue | ||||
| Route information | ||||
| Maintained by TDOT | ||||
| Length | 158.31 mi (254.78 km) | |||
| Major junctions | ||||
| West end |  US 64 in Whiteville | |||
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| East end |  US 70S in Nashville | |||
| Location | ||||
| Country | United States | |||
| State | Tennessee | |||
| Counties | Hardeman, Chester, Henderson, Decatur, Perry, Hickman, Williamson, Davidson | |||
| Highway system | ||||
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State Route 100 (SR 100) is a west–east state highway in both West Tennessee and Middle Tennessee that connects Whiteville with Nashville. It is 158.31 mi (254.8 km) long.