Interstate 40 (I-40) is a major east–west transcontinental Interstate Highway in the southeastern and southwestern portions of the United States. At a length of 2,556.61 miles (4,114.46 km), it is the third-longest Interstate Highway in the country, after I-90 and I-80. From west to east, it passes through California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, and North Carolina. Its western terminus is at I-15 in Barstow, California, while its eastern terminus is at a concurrency with U.S. Route 117 (US 117) and North Carolina Highway 132 (NC 132) in Wilmington, North Carolina. Major cities served by the interstate include Flagstaff, Arizona; Albuquerque, New Mexico; Amarillo, Texas; Oklahoma City, Oklahoma; Little Rock, Arkansas; Memphis, Nashville, and Knoxville in Tennessee; and Asheville, Winston-Salem, Greensboro, Durham, Raleigh, and Wilmington in North Carolina.
U.S. Route 270 (US 270) is a spur of US 70. It travels for 643 miles (1,035 km) from Liberal, Kansas at US 54 and US 83 to White Hall, Arkansas at Interstate 530 (I-530) and US 65. It travels through the states of Arkansas, Oklahoma, and Kansas. It travels through the cities of Oklahoma City, Oklahoma, Hot Springs, Arkansas, and McAlester, Oklahoma.
State Highway 66 is a 192.7-mile (310.1 km) state highway in the U.S. state of Oklahoma, beginning at U.S. Highway 81 in El Reno and ending at U.S. Highway 60 near White Oak. The highway was designated in 1985 as a replacement for the decommissioned U.S. Highway 66. Although most of the highway follows Historic Route 66, the highway follows US 66's final alignment, joining Interstate 44 through Tulsa and Oklahoma City, while older versions of the route follow various city streets through both cities.
State Highway 99 (SH-99) is a north–south state highway through central Oklahoma. It runs from the Texas state line at Lake Texoma to the Kansas state line near Lake Hulah. It is 241.5 miles (388.7 km) long. The highway overlaps U.S. Highway 377 (US-377) for over half its length.
State Highway 77H is a spur that runs from US-77 in Norman, north through a small piece of unincorporated Cleveland County and Moore, to Oklahoma City. The state highway designation ends at I-240, although Sooner Road continues north to its terminus at I-35, I-44, Turner Turnpike, Kilpatrick Turnpike, and SH-66.
State Highway 51, abbreviated to SH-51 or OK-51, is a major state highway in Oklahoma, United States. It runs for 332.8 miles (535.6 km) east–west across the state, running from the Texas state line to Arkansas. It is the third-longest state highway in the system.
State Highway 270, abbreviated as SH-270, is a 14.45-mile-long (23.26 km) state highway in Oklahoma and Pottawatomie counties in Oklahoma, United States. It runs on a former alignment of U.S. Route 270 (US-270) between US-62 in Harrah and US-177 north of Shawnee. SH-270 has no lettered spur routes.
State Highway 325, officially, SH-325, is a 38.08-mile (61.28 km)state highway Cimarron County, Oklahoma, United States, that connects New Mexico State Road 456 to the traffic circle in Boise City that includes U.S. Route 56, U.S. Route 64, U.S. Route 287, U.S. Route 287, U.S. Route 412 and Oklahoma State Highway 3. Along the way it provides access to Black Mesa State Park, near Black Mesa, the highest point in the state of Oklahoma.
State Highway 8, also abbreviated as SH-8 or OK-8, is a highway maintained by the U.S. state of Oklahoma. Because it runs mainly north–south, it has an even number. Highway 8 runs from U.S. Highway 277 in Cyril, Oklahoma to the state line south of Kiowa, Kansas, for a total length of 179.1 miles (288.2 km) The highway has two lettered spur routes.
State Highway 6, abbreviated SH-6 or OK-6, is a state highway in Oklahoma. It runs in a 121.8 miles (196.0 km) crescent through the southwestern part of the state, running from the Texas state line north of Quanah, Texas, to SH-152 in the unincorporated town of Sweetwater. There are no letter-suffixed spur branching from SH-6.
State Highway 50 is a state highway in northwestern Oklahoma. The majority of the 37.7-mile (60.7 km) highway is in Woodward County, though the northernmost three miles (4.8 km) are in Woods County. SH-50 runs near two state parks and has a lettered spur that goes to each of them.
State Highway 108 is a minor state highway in Payne, Noble, and Pawnee counties in north-central Oklahoma. It runs for 24.1 miles (38.8 km), from SH-33 south of Ripley to U.S. Route 64 (US-64) in Lela. It has no lettered spurs.
State Highway 56 is a state highway in the U.S. state of Oklahoma. The road serves Seminole County, Okfuskee County, and Okmulgee Counties in central and east-central Oklahoma. In Seminole County, it is also designated as the Seminole Nation Highway in honor of the contributions the Seminole Nation has made to the state of Oklahoma.
State Highway 34 is a state highway in the U.S. state of Oklahoma. It runs for 188.3 miles (303.0 km) south-to-north in the western part of the state. The highway begins northeast of Eldorado, in the southwest corner of the state, and extends north to the Kansas state line between Woodward and Coldwater, Kansas.
State Highway 58 is the name of two state highways in Oklahoma. One of them runs for 72.7 miles (117.0 km) from Medicine Park to the Blaine–Custer County line near Hydro, and the other connects US-270/281/SH-3/33 to the Kansas state line, a length of 105.9 mi (170.4 km). The northern section has one lettered spur route, SH-58A.
U.S. Route 81 (US-81) is a north–south U.S. highway running through the central United States' Great Plains region, from Fort Worth, Texas to the U.S.–Canadian border at Pembina, North Dakota. A 229.28-mile (368.99 km) segment of the highway lies within the state of Oklahoma. US-81 crosses the Red River from Texas south of Terral, passing through several Oklahoma cities, such as Chickasha, El Reno, Kingfisher, and Enid, before entering Kansas north of Renfrow.
U.S. Route 169 is a U.S. highway that begins in Tulsa southeast of Downtown. The highway runs north into Kansas.
Sixteen special routes of U.S. Route 62 currently exist. Seven of them lie within the state of Arkansas. Three existed in the past but have since been decommissioned.
