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	Future I-69 / US 51 / Purchase Parkway 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.^[2] 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 the Purchase Parkway, while SR 3 remains on the old road, now U.S. Route 45.^[1]