Oklahoma State Highway 18

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State Highway 18
Route information
Maintained by ODOT
Length	134.4 mi[1] (216.3 km)
Existed	1924–present
Major junctions
South end	US 177 / US 270 / US 270 Bus. / SH-3W in Shawnee
Major intersections	I-40 in Shawnee US 62 in Meeker I-44 / Turner Turnpike in Chandler Future I-42 / US 412 / Cimarron Turnpike near Maramec US 64 in Pawnee
North end	K-15 at the Kansas state line
Location
Country	United States
State	Oklahoma
Highway system
Oklahoma State Highway System Interstate US State Turnpikes
← SH-17A → SH-19

State Highway 18, abbreviated as SH-18 or OK-18, is a highway maintained by the U.S. state of Oklahoma. It was once one of the longest state highways in the Oklahoma road system, but now has a total length of 134.4 mi (216.3 km).