In the northwest

SH 3 begins at the Colorado state line 19 mi (31 km) north of Boise City, Oklahoma. At this terminus, it is concurrent with US-287/US-385. It remains concurrent with the two U.S. Routes until reaching Boise City, where it encounters a traffic circle which contains five other highways. After the circle, US-385 splits off, and SH-3 overlaps US-287, US-56, US-64, and US-412, though US-56 and US-287 both split off within the next 8 miles (13 km).

In Guymon, US-64 splits off. At Elmwood, US-270 joins US-412, coming from a concurrency with SH-23. SH-3 remains concurrent with US-270 through Watonga. In Seiling, US-183 leaves the concurrency but is quickly replaced by U.S. Highway 281. SH-33 joins the roadbed 20 miles (32 km) later.

In Watonga, SH-33 and SH-3 split off from US-270 and US-281. SH-3 and SH-33 remain concurrent for an additional 28 miles (45 km), until Kingfisher, where SH-3 joins US-81. It will stay concurrent with US-81 for 13 miles (21 km), through the town of Okarche. 3 miles (4.8 km) after Okarche, SH-3 leaves US-81. This marks the first point that SH-3 has not been part of a concurrency.

Through Oklahoma City

Beginning at the split from US-81, SH-3 becomes a major artery in the Oklahoma City highway system, commonly known as the Northwest Expressway because it is a diagonal route and because it serves the northwestern part of the metro area. It skirts the northern limits of El Reno before entering the Oklahoma City limits. The often-congested Northwest Expressway passes through the suburb of Warr Acres and passes close to Lake Hefner.

At the intersection with the Lake Hefner Parkway (SH-74), SH-3 again re-enters a concurrency. The Lake Hefner Parkway ends very shortly after, and SH-3 becomes concurrent with I-44 through the western side of the city. Near Will Rogers World Airport, SH-3 transfers to I-240 along the southern side of the city. After I-240 ends, SH-3 is transferred onto I-40/US-270, which it remains concurrent with for 16 miles (26 km).

SH-3E/3W split

In Shawnee, SH-3 splits into two highways, SH-3E and SH-3W. SH-3W splits off I-40 onto US-177, along with US-270, at milemarker 181 on I-40. It continues along with US-270 and 177 through the west side of Shawnee and continues south of that city until Tecumseh, where US-270 splits off. South of Asher, SH-3W leaves US-177 and veers southeast toward Ada.

SH-3E, the longer of the two split routes, was the original routing of Highway 3 before the two highways were split. It remains on I-40 for 5 miles (8.0 km) after SH-3W splits off. When it does split off, it soon joins SH-18. It follows a route closer to the center of Shawnee. After leaving Shawnee, it heads southeast toward Seminole. Here, it meets US-377/SH-99. SH-3E merges onto this highway, and they will remain concurrent until after they reach Ada.

In Ada, SH-3E and SH-3W are reunited and become SH-3 once again.

Ada to Atoka

SH-3 then becomes part of the Richardson Loop, a freeway around the west and south sides of Ada. Throughout the Richardson Loop, it overlaps SH-1 and US-377/SH-99 at different times. The highway then becomes two-lane once again and heads southeast to the town of Coalgate, where begins an 18-mile (29 km) concurrency with US-75, lasting through Atoka. In Atoka, US-75 splits off to join US-69.

Antlers to Arkansas

Two miles west of Antlers, the highway has an interchange with the Indian Nation Turnpike, and in Antlers it intersects U.S. Highway 271. After reaching the town of Broken Bow, it turns southward and overlaps US-259 and US-70.

Near Idabel, the highway splits off after being with US-259 for 13 miles (21 km). 28 miles (45 km) later, it becomes AR 32 as it crosses the state line into Arkansas.

SH-3E

More information County, Location ...

County	Location	mi[2]	km	Exit	Destinations	Notes
Pottawatomie	​	387.0	622.8	181	I-40 / SH-3 west / SH-3W east / US 177 / US 270 – Stillwater, Tecumseh	Exit numbers follow I-40; eastern end of I-40 concurrency; SH-3E west and SH-3W merge into SH-3
	Shawnee			185	Kickapoo Street – Shawnee
		389.7	627.2		I-40 east / SH-18 north – Meeker	Western end of SH-18 concurrency; I-40 exit 186
		391.7	630.4		SH-18 south (Harrison Street south)	Eastern end of SH-18 concurrency
	Earlsboro	397.6	639.9		SH-9A to I-40 – Earlsboro
	​	398.9	642.0		SH-99A east	Western terminus of SH-99A
Seminole	Seminole	406.5	654.2		US 270 west / SH-9 – Eufaula, Norman	Western end of US-270 concurrency
		408.9	658.1		US 270 east (Broadway Avenue east) / US 377 / SH-99 north (Milt Phillips Avenue north)	eastern end of US-270 concurrency, western end of US-377/SH-99 concurrency
		411.4	662.1		SH-59 west – Maud	Western end of SH-59 concurrency
	Bowlegs	414.1	666.4		SH-59 east – Bowlegs, Wewoka	Eastern end of SH-59 concurrency
	​	428.5	689.6		SH-39 west (Broadway Street) / SH-56 east – Wewoka, Konawa	Eastern terminus of SH-39; western terminus of SH-56
Canadian River					Haney-Abbott Bridge
Pontotoc	Ada	439.4	707.1	—	US 377 / SH-99 south / SH-1 east – Agri-Plex, Ada, McAlester	West end of freeway; eastern end of US-377/SH-99 concurrency, western end of SH-1 concurrency
	​	440.4	708.8	—	SH-3W / SH-19 west – Shawnee	Eastbound exit and westbound entrance; eastern terminus of SH-19
	​				Ada	Eastbound exit and westbound entrance
	​				SH-3 east / SH-1 (J.A. Richardson Loop)	SH-3E east and SH-3W merge into SH-3
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access       Route transition

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SH-3W

More information County, Location ...

County	Location	mi[8]	km	Destinations	Notes
Pottawatomie	​			I-40 / SH-3 west (US 270 west) – Oklahoma City	Interchange; SH-3W west and SH-3E merge into SH-3; western end of US-270 concurrency; I-40 exit 181
	​			I-40 east (SH-3E east) – Okemah	Interchange; westbound exit and eastbound entrance; I-40 exit 181
	​			US 177 north to SH-270	Interchange; left entrance eastbound, left exits; western end of US-177 concurrency
	Shawnee	387.3	623.3	US 270 Bus. east (Kickapoo Spur)	Interchange; western terminus of US-270 Bus.
		388.8	625.7	US 270 Bus. west / SH-18 north (Farrall Avenue)	Interchange; southern terminus of SH-18, eastern terminus of US-270 Bus.
	Tecumseh	392.4	631.5	Tecumseh	Interchange
		394.6	635.0	US 270 east / SH-9 – Tecumseh, Seminole	Eastbound exit split into "US-270 / SH-9 east – Seminole" and "SH-9 west – Tecumseh"; eastern end of US-270 concurrency
	Chisney	401.4	646.0	SH-59B west – Macomb	Eastern terminus of SH-59B
	Pearson	406.4	654.0	SH-59 east – Pearson, St. Louis	Northern end of SH-59 concurrency
	Asher	412.4	663.7	SH-39 – Konawa, Lexington, Purcell
Canadian River				Pottawatomie–Pontotoc county line
Pontotoc–McClain county line	​	415.1	668.0	US 177 south / SH-59 west – Stratford, Sulphur	Southern end of US-177/SH-59 concurrency
Pontotoc	​	421.0	677.5	SH-59A west	Eastern terminus of SH-59A
	​	431.9	695.1	SH-19 west – Stratford, Pauls Valley	Interchange
	​	433.4	697.5	SH-3E west / SH-1 (J.A. Richardson Loop) / Main Street – McAlester, Seminole, Ada	Interchange; eastbound left exit and westbound entrance (left entrance from Main St.)
	​			SH-3 east / SH-1 (J.A. Richardson Loop) / SH-19 end – Roff, Coalgate	Interchange; SH-3W east and SH-3E merge into SH-3; eastern terminus of SH-19
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access       Route transition

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