State Route 78

State Route 78 (abbreviated SR 78) is a 36.93-mile (59.43 km) long primary state highway in northwestern Tennessee, USA. This highway carries a dual primary and secondary designation, however, the majority of this highway is signed as a Primary State Highway. The only portion of SR 78 designated as secondary is between its southern terminus at SR 104 to US 51 in Dyersburg.​

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Length of Route
36.01 mi.

Begins:
SR 104 in Dyersburg​

Ends:
KY 94 at the Kentucky state line in Lake County​

Counties Covered:
Dyer, Obion, Lake​

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