Route 18
Route information
Maintained by MoDOT
Length	55.88 mi (89.93 km)
Major junctions
West end	359th Street / State Line Road at the Kansas state line in Drexel
Major intersections	I-49 / US 71 in Adrian
East end	Route 7 / Route 13 / Route 52 in Clinton
Location
Country	United States
State	Missouri
Highway system
Missouri State Highway System Interstate US State Supplemental
← Route 17 → Route 19

Route 18 is a highway in western Missouri. Its eastern terminus is at the intersection of Route 13/Route 52 and Route 7 in Clinton. Its western terminus is at the Kansas state line near Drexel. It continues into Kansas as a county road.

Route 18 begins at the Kansas state line just west of Drexel. It runs for three miles (5 km) along the Cass/Bates County line. Route 18 then turns south to Merwin, where it turns back east. It then runs through Adrian, before having a diamond interchange with the Interstate 49/U.S. Route 71 freeway.^[1] Route 18 then runs south of Altona and through Ballard. It then runs through Clinton. Route 18 then ends at Routes 7, 13, and 52.

County	Location	mi[2]	km	Destinations	Notes
Bates	Drexel	0.00	0.00	359th Street / State Line Road	Western terminus; Kansas state line
	Adrian	20.84	33.54	I-49 / US 71	I-49 exit 141; diamond interchange[1]
Henry	Clinton	54.69	88.02	Route 13 Bus. (2nd Street)
		55.88	89.93	Route 7 / Route 13 / Route 52	Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi