U.S. Route 421 in Tennessee
highway in Tennessee
U.S. Route 421 (US 421) is a north–south United States highway that runs for 43.4 miles (69.8 km) in East Tennessee, connecting the cities of Mountain City and Bristol.
The entire route is overlapped with SR 34, save for approximately a half mile between US 11E/US 19 and the Virginia State Line.
Route description
Johnson County
US 421 enters Tennessee from North Carolina just north of Zionville, NC in Johnson County, concurrent with unsigned SR 34, as a 2-lane highway. The highway then goes northwest to enter the oldest unincorporated community in the state, Trade, where it begins an unsigned concurrency with SR 67. The highway continues northwest through countryside and farmland before becoming the eastern boundary of the Cherokee National Forest at the intersection of Bulldog Road before completely entering the National Forest after the intersection with Old Prison Camp Road.
US 421/SR 34/SR 67 then pass and curve around various ridges and mountains before exiting the national forest and entering Mountain City, widening to an undivided 4-lane highway. They pass by an industrial plant and a couple of neighborhoods before having an intersection with SR 167. The highway then passes by a row of businesses before having an intersection with SR 418 and bypassing downtown to the south and west, where they come to another intersection with SR 418, where SR 67 splits off and goes southwest towards Elizabethton. US 421/SR 34 soon come to an intersection and become concurrent with SR 91, just before narrowing to 2-lanes and leaving Mountain City. The highway then passes through more countryside and farmland before the road becomes aggressively curvy with elevation changes throughout as it crosses the Iron Mountains, where the road becomes curvy with elevation changes throughout for several miles.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 16, 2026. The linked authority identifier is Q7863374. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
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This entry incorporates text from “U.S. Route 421 in Tennessee” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.