Oklahoma State Highway 20

Eastern terminus of State Highway 20 at Missouri Route 43

SH-20 begins just north of the Arkansas River at SH-18 near Ralston. From there, it heads east through Osage County for 20 miles (32 km) without crossing any other highway. At mile 20.4, it meets State Highway 99 in Hominy. East of Hominy, SH-20 crosses Lake Skiatook before passing through Skiatook and entering Tulsa County. Shortly after entering Tulsa County, SH-20 has a junction with SH-11. Four miles later, it has an interchange with US-75. After running through Collinsville, it turns southward onto the US-169 freeway.

SH-20 splits from US-169 north of Owasso. It then enters Claremore, where it meets SH-88 and SH-66 (old Route 66). It connects to the Claremore toll plaza on I-44/Will Rogers Turnpike. East of Claremore, SH-20 becomes a divided expressway before intersecting US-69 in Pryor. West of Salina, the highway bridges Lake Hudson. In Salina, SH-20 meets SH-82, with which it begins a concurrency.

Headed north from Salina, the two highways begin to cross some mountainous terrain. The highways provide access to Spavinaw State Park, before running through the town of Spavinaw, Oklahoma. North of Spavinaw, SH-20 splits off to the east, running through unincorporated Chloeta and serving as the eastern terminus of SH-28. SH-20 overlaps US-59/State Highway 10 through Jay. SH-20 then splits off to the east, running 11 miles (18 km) to the Arkansas line.

The easternmost miles run north/south along the Oklahoma–Arkansas state line, and along this stretch the highway overlaps Arkansas's Highway 43. The highway continues northward into Missouri at the point where the Oklahoma, Arkansas and Missouri borders meet, and thereafter becomes Missouri Route 43.

On April 10, 2008, a section of SH-20 in Rogers County near Keetonville, west of Claremore, was closed due to a landside caused by heavy rains.[2] A 500-foot (150 m) section of roadbed was washed away, forming a large crack in the pavement and damaging the guardrail.[3] The highway was re-opened June 5, 2008 after being repaired.

All exits are unnumbered.

State	County	Location	mi[1]	km	Destinations	Notes
Oklahoma	Osage	​	0.00	0.00	SH-18 – Ralston, Fairfax	Western terminus
		Hominy	20.3	32.7	SH-99
	Tulsa	Skiatook	44.2	71.1	SH-11
		Collinsville	48.2	77.6	US 75 – Tulsa, Bartlesville	Diamond interchange
			53.7	86.4	US 169 north – Nowata	West end of freeway section; western end of US-169 concurrency
		​	54.9	88.4	E. 136th Street N.	Parclo interchange
		​	55.7	89.6	E. 126th Street N.	Diamond interchange
		Owasso	56.7	91.2	US 169 south	East end of freeway section; eastern end of US-169 concurrency
	Rogers	Claremore	68.6	110.4	SH-88 north (Will Rogers Boulevard west) / Moore Avenue	Western end of SH-88 concurrency
			69.4	111.7	SH-66 east (Lynn Riggs Boulevard north)	Northern end of SH-66 concurrency; former US 66 east
			69.5	111.8	SH-66 west / SH-88 south (Lynn Riggs Boulevard south)	Southern end of SH-66/SH-88 concurrency; former US 66 west
			70.9	114.1	I-44 / Will Rogers Turnpike – Joplin, Tulsa	I-44 exit 255
	Mayes	Pryor	86.3	138.9	US 69 (Mill Street)
		Salina	96.0	154.5	SH-82 south	Western end of SH-82 concurrency
		Spavinaw	110.5	177.8	SH-82 north	Eastern end of SH-82 concurrency
	Delaware	​	119.5	192.3	SH-28	Eastern terminus of SH-28
		Jay	124.0	199.6	US 59 / SH-10 south – Upper Spavinaw Recreation Area, Kansas	Western end of US-59/SH-10 concurrency
			125.7	202.3	SH-127	Southern terminus of SH-127
			126.2	203.1	US 59 / SH-10 north – Grove	Eastern end of US-59/SH-10 concurrency
Oklahoma–Arkansas line	Delaware–Benton county line	​	137.2	220.8	AR 43 south – Maysville Ark.	Western end of AR 43 concurrency
Oklahoma–Missouri– Arkansas state tripoint	Delaware–McDonald– Benton county tripoint	OKARMO Corner	142.7	229.7	AR 43 ends / Route 43 north – Southwest City	Continuation into Missouri; northern end of AR 43 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus        Tolled

• SH-20 at OKHighways.com
• OK-20 on Two Wheel Oklahoma