U.S. Route 51 in Tennessee

U.S. Route 51
U.S. Route 51
State Route 3
	U.S. Route 51 in Tennessee, highlighted in red
Route information
	Maintained by TDOT
Length	135.90 mi (218.71 km)
Major junctions
South end	US 51 at the Mississippi state line
	I-55 in Memphis; US 78 in Memphis; US 64 / US 70 / US 72 / US 79 in Memphis; I-240 in Memphis; I-40 in Memphis; Future I-69 / SR 300 in Memphis; I-269 / SR 385 in Millington; I-155 / US 412 in Dyersburg; Future I-169 / US 45W / SR 22 near Union City; US 45 / US 45E in South Fulton;
North end	I-69 / US 51 at the Kentucky state line
Location
Country	United States
State	Tennessee
Counties	Shelby, Tipton, Lauderdale, Dyer, Obion
Highway system
	United States Numbered Highway System; List; Special; Divided; Tennessee State Routes; Interstate; US; State;

U.S. Route 51 (US 51), mostly overlapped by the unsigned State Route 3 (SR 3), is a north–south state highway in the U.S. state of Tennessee, that is 135.9 miles (218.71 km) long, completely within West Tennessee. It begins in Shelby County and ends in Obion County. The SR 3 designation is seen largely on mileposts.

The two places where US 51 and SR 3 differ are in Memphis, where US 51 has been moved to Danny Thomas Boulevard (State Route 1 / State Route 4), while SR 3 remains on the one-way pair of 2nd and 3rd Streets, and in South Fulton, where US 51 crosses the state line on State Route 215 to I-69, while SR 3 remains on the old road, now U.S. Route 45.