Tennessee US 25W carries the unsigned designation of
State Route 9 (SR 9) throughout the state. US 25 splits into US 25W and
US 25E on the west side of downtown
Newport. Here,
SR 32 goes north on US 25E and
US 70/SR 9/
SR 35 continue on US 25W. The concurrency then has a full interchange with
Interstate 40 (I-40; exits 432A–B) before
US 411/SR 35 separate and turn south while US 25W/US 70/SR 9 leave Newport and cross into
Jefferson County. Immediately after crossing the county line, they intersect
SR 363 in
Reidtown and then cross
Douglas Lake parallel to the I-40 bridge. After crossing the lake, they intersect
SR 113 and then proceed to
Dandridge where
SR 66 joins the concurrency. US 25W/US 70/SR 9/SR 66 next intersect and become concurrent with
SR 92, passing by downtown to the north (SR 66 is unsigned at this intersection). SR 92 separates from the concurrency which proceeds to have another interchange with I-40 (exit 415); SR 66 separates thereafter and runs concurrent to I-40 before leaving Dandridge. US 25W/US 70/SR 9 continue west through rural Jefferson County before coming to an intersection with Snyder Road (which connects to SR 66 and
Sevierville) and becoming concurrent with
SR 139 before crossing into
Sevier County. Once across the county line, SR 139 separates and turns south toward
Kodak while US 25W/US 70/SR 9 continue west to cross into
Knox County. The highway then has an interchange with
US 11E/
SR 34 in
Carter (also known as Trentville) with US 11E joining the concurrency as they enter
Knoxville. US 11E/US 25W/US 70/SR 9 then intersect
SR 168 (Governor John Sevier Highway) before crossing a bridge over the
Holston River. After this section, US 25W/SR 9 leaves the US 11E/US 70 concurrency to join I-40 at exit 394. It travels a short way before leaving I-40 to follow
I-640 (exit 385). They then have interchanges with Mall Road (which provides access to
Knoxville Center Mall at exit 8),
US 441/
SR 33/
SR 331 (Broadway; which provides access to
Fountain City at exit 6), and
I-75/
I-275 (exit 3A) before separating from I-640 to turn north at exit 3B. US 25W/SR 9 continues through the North Knoxville neighborhood as Clinton Highway and leaves Knoxville to enter
Powell. In Powell, they intersect and have a short concurrency with
SR 131 before leaving Powell and crossing into
Anderson County. The highway next enters
Claxton and becomes a very curvy four-lane undivided highway. In Claxton, US 25W/SR 9 intersects
SR 170 and continues north from Claxton, winding its way through rural areas for a few miles to enter
Clinton. Here, they intersect
SR 61 before going straight through the historic downtown as Main Street. US 25W/SR 9 then leave Clinton, becoming curvy again before going through
Medford to enter
Rocky Top. In Rocky Top, US 25W/SR 9 goes through downtown to intersect and become concurrent with
SR 116. The highway next intersects US 441/
SR 71 (which provides access to Norris
Lake and
Dam) before coming to an interchange where US 25W/SR 9 becomes concurrent with I-75 (exit 129) leaving SR 116 to trace the historical route of US 25W/SR 9. They cross into
Campbell County and enter
Caryville where they separate from I-75 (exit 134) and become concurrent with
SR 63. Immediately afterward, they intersect the northern end of SR 116 and pass by
Cove Lake,
Cove Lake State Park, and
Caryville Dam before leaving Caryville to enter
Jacksboro. In Jacksboro, US 25W/SR 9/SR 63 bypass downtown to the north and go through Jacksboro's main business area before proceeding into downtown
LaFollette. There, they separate from SR 63 and turn north, becoming very curvy again as the road enters mountainous terrain to pass through
Duff, cross
Brushy Mountain Gap, then descend into the valley carved by Lick Creek and the
Clear Fork of the
Cumberland River. Here, they pass through
Habersham then intersect
SR 90 at
Morley. US 25W/SR 9 finally enters
Jellico and have another interchange with I-75 (exit 160) before proceeding to downtown and intersecting
SR 297 before turning north and ending at the
Kentucky state line, with US 25W continuing north alone into Kentucky.
Kentucky Upon entry into
Whitley County, US 25W runs parallel with and closely follow
I-75 for the rest of its course, including the points where it traverses the towns of
Williamsburg and
Corbin. It continues to parallel Clear Fork as the highway travels down a narrow valley, passing through the communities of
Red Ash,
Saxton,
Pleasant View, and
Emlyn. US 25W enters Williamsburg and immediately intersects with
KY 92, running concurrently with it as they cross over the
Cumberland River and KY 92 leaves the concurrency to head east to
Pineville after about . The highway follows the east bank of the river, passes the entrance to downtown and continues north through the Highland Park neighborhood before leaving Williamsburg and intersecting
KY 26 near
Wofford. It then intersects I-75 (exit 15) with an unusual (for Kentucky)
double roundabout interchange before winding its way north through farmland and rural areas. US 25W next intersects with
KY 90 (providing access to
Cumberland Falls) and
KY 1193 before entering Corbin and crossing I-75 for the last time (exit 25). It passes through a business district and some neighborhoods, where it has an intersection with
KY 3041 (Corbin Bypass), before meeting back up with KY 26 and passing straight through downtown via a one-way pair between Main Street and Kentucky Avenue. The highway passes through more neighborhoods before crossing Lynn Camp Creek into
North Corbin and
Laurel County. US 25W passes straight through downtown before coming to an intersection north of town, where
US 25E and US 25W reunites to become
US 25. However, US 25E continues west of this point to terminate at exit 29 of I-75. ==History==