U.S. Route 51 in Tennessee

Section of U. S. Highway in Tennessee, United States

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 the Purchase Parkway, while SR 3 remains on the old road, now U. S. Route 45. US 51 carries the Tennessee Scenic Parkway designation from its junction with SR 385 in Millington to SR 104 in Dyersburg and also carries the Great River Road designation from US 64/US 70/US 79 in Memphis to SR 88 in Halls. The Union City Bypass was opened in February 2024 under the temporary designation of SR 690, but there is currently no timeline for when the Troy bypass will be built.

U. S. Route 51 Business (US 51 Bus.) is a 3.9 mile (6 km) business route of US 51 located entirely in the city of Dyersburg in Dyer County. It has the unsigned designation of State Route 211 (SR 211) for its entire length. The highway begins as South Main Avenue at a large three way intersection with US 51/SR 3 on the southern edge of the city. It heads north, concurrent with SR 211, as a two lane road through a business district before traveling through wooded areas and crossing a bridge over the North Fork of the Forked Deer River into downtown. US 51 Bus./SR 211 pass by the Dyer County Courthouse and becomes concurrent with SR 104 (East Court Street) as the road becomes North Main Avenue shortly before making an abrupt left turn onto McGaughey Street. US 51 Bus./SR 211 then split before heading through neighborhoods along Troy Avenue before turning right onto Gordon Street. The highway then makes a left turn onto North Sampson Avenue and passes through more neighborhoods before merging onto St. John Avenue. They then travel through a business district before widening to a four lane highway and coming to an end at an intersection with US 51/SR 3, where US 51 Bus. ends and SR 211 follows northbound US 51/SR 3 north on St. John Avenue.