  State Route 21 | ||||
|---|---|---|---|---|
 SR 21; primary in red, secondary in blue | ||||
| Route information | ||||
| Maintained by TDOT | ||||
| Length | 39.88 mi (64.18 km) | |||
| Existed | October 1, 1923[1]–present | |||
| Major junctions | ||||
| West end | Mississippi River near Tiptonville | |||
  SR 22 / SR 78 at Tiptonville US 51 at Troy US 45W in Union City US 51 / SR 22 in Union City  SR 690 / Future I-69 in Union City | ||||
| East end |   KY 116 / KY 239 north of Union City at the Kentucky state line | |||
| Location | ||||
| Country | United States | |||
| State | Tennessee | |||
| Counties | Obion, Lake | |||
| Highway system | ||||
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State Route 21 (SR 21) is a two lane highway that runs from the Mississippi River west of Tiptonville, Tennessee to the Kentucky state line north of Union City. This road provides access to Reelfoot Lake State Park.
- ^ Highway Planning Survey Division (1925). Biennial Report of the Commissioner of the Department of Highways and Public Works State of Tennessee for the Years 1923 and 1924 (PDF) (Report). Nashville: Tennessee Department of Highways and Public Works. pp. 39–44. Retrieved May 19, 2023.