The Panhandle U.S. Route 412 crosses the New Mexico–Oklahoma state line northeast of
Clayton, New Mexico,
concurrent with
US-56 and
US-64. The three highways enter the state just north of the extreme southwest corner of
Cimarron County, the westernmost tip of the
Oklahoma Panhandle. The highways head northeast, passing through disconnected parcels of the
Rita Blanca National Grassland. The first town US-56, US-64, and US-412 encounter in Oklahoma is unincorporated
Felt, which they skirt the northern edge of. The highways then cross the
Beaver River before intersecting
US-385, which joins the other three highways in a concurrency as they approach
Boise City, the county seat. In Boise City, the highways reach a traffic circle which surrounds the
Cimarron County Courthouse. At this traffic circle, US-56, US-64, and US-412 all turn east, while US-385 splits away to the north.
State Highway 3 (SH-3) enters the circle from the north and leaves from the east, following US-412, while
SH-325 begins at the circle and heads west toward
Kenton. East of town, US-56/US-64/US-412/SH-3 have an interchange with
US-287, which bypasses Boise City to the east. northeast of here, US-56 splits away from the other highways; it continues northeast, while US-64/US-412/SH-3 turn onto a due east course. The routes intersect
SH-171 east of the split. Approximately east of the SH-171 junction, US-64/US-412/SH-3 cross into
Texas County. east of the county line, at unincorporated
Four Corners,
SH-95 joins the concurrency; it splits away after following the other three routes for . Shortly after entering Woodward County, US-270/US-412/SH-3 enter the town of
Fort Supply. There, the routes junction with
US-183, which joins the other routes as they make their way southeast. southeast of Fort Supply, the four highways enter the city of
Woodward, the largest city within a nine-county area and the commercial hub of northwest Oklahoma. On the west edge of town, the four highways serve as the eastern terminus of the western segment of
SH-15, a route made discontinuous by the establishment of US-412 (see
history). US-270/US-183/US-412/SH-3 proceed east through Woodward. In downtown, they meet with
SH-34; here, US-412 leaves the four-way concurrency, as it continues east by itself while the other three highways it has followed since Fort Supply turn south to overlap SH-34 instead. For the first time since its western terminus in New Mexico, where it began concurrent with
US-56, US-412 is the sole highway designation on the road it follows. As US-412 leaves town, it passes south of
Boiling Springs State Park, running parallel to
SH-34C and
SH-50B, both of which serve the park. Along this stretch, it crosses the Beaver River for the third and final time, though this time it has since become the
North Canadian River.
SH-50 forms a concurrency with US-412 for before splitting off again in
Mooreland. East of the US-177 interchange, the highway curves to the south, crossing
Black Bear Creek. Just south of the county line, the freeway has an interchange with
SH-151, a short connector route that runs across Lake Keystone's dam. At this interchange the Keystone Expressway ends. The Sand Springs Expressway continues from here, through
Sand Springs, where it includes an interchange with
SH-97 and
SH-51, the latter of which joins US-64/US-412 on the freeway. The three routes then continue east into
Tulsa proper. The Sand Springs Expressway comes to an end at the northwest corner of the Inner Disperal Loop (IDL), a ring of freeways surrounding
Downtown Tulsa. At a
stack interchange there, US-64 and SH-51 split away to the south along
I-244; this will be the final intersection US-412 and US-64 will have in Oklahoma. US-412 continues east along I-244. This interchange is also the southern terminus of
L.L. Tisdale Parkway. I-244 and US-412 form the north side of the IDL; at its northeast corner, they interchange with
US-75, the east side of the loop; south of the interchange, US-75 also carries the
I-444 designation. In Rogers County, the three highways enter the city of
Catoosa, one of Tulsa's eastern suburbs. In Catoosa, the freeway serves as the southern terminus of
SH-167, which serves
the city's port, and SH-66 splits off toward
Claremore. I-44 and US-412 continue east for a short distance before going separate directions; I-44 exits from US-412 and joins the
Will Rogers Turnpike. This interchange is also the northern terminus of the
Creek Turnpike. US-412 becomes an expressway, and continues east of the interchange, passing through
Fair Oaks on its way out of the Tulsa metro. In rural south-central Rogers County, it connects to SH-412P, a state highway spur to
Port 33, before crossing the
Verdigris River, a component of the
McClellan–Kerr Arkansas River Navigation System. US-412 continues east through unincorporated territory before reaching
Inola, where it has an interchange with
SH-88, north of that highway's southern terminus. US-412 then heads eastward out of Rogers County. After leaving Rogers County, the next county along US-412 is
Mayes County. South of
Chouteau, the route provides access to
US-69 via an interchange. Just west of US-412's crossing of the
Grand River, the highway intersects SH-412B, which connects US-412 to
SH-69A. After crossing the river, US-412 comes to a fork in the road; one half of the fork is the
Cherokee Turnpike, which mainline US-412 follows, while the other is
US-412 Alternate, which runs parallel to the turnpike on an old alignment of US-412. The first interchange on the Cherokee Turnpike is with
SH-82 in
Locust Grove. The turnpike continues east, passing into
Delaware County, to intersect US-412 Alternate again between
Rose and
Leach. East of this interchange, a service area lies in the median of the roadway; east of there, the highway passes through the Cherokee Turnpike's only mainline toll plaza. The turnpike's final interchange is with
US-59 and
SH-10 in
Kansas. The Cherokee Turnpike then ends, merging with US-59; at this junction, US-412 Alternate, which was concurrent with US-59, also ends. US-59 and US-412 continue southeast through
Flint, before turning due east to
West Siloam Springs. There, US-59 splits away from US-412, while US-412 remains on an easterly trajectory, crossing the state line into
Siloam Springs, Arkansas. ==History==