Auxiliary routes of Arkansas Highway 18
Three auxiliary routes of Arkansas Highway 18 exist in Northeast Arkansas, with one former alignment.
Newport spur
Arkansas Highway 18 Spur is a spur route that runs to Newport Municipal Airport. The route is in length, and two-lane, undivided.;Major intersections
Jonesboro spur
Arkansas Highway 18 Spur is a spur route in Jonesboro known as Dr. Martin Luther King Jr. Drive. The route is in length, connecting Highway 18 to I-555. Dr. Martin Luther King Jr. Drive is two-lane undivided. Its entire length is concurrent with U.S. Route 78.;Major intersections
Manila business route
Arkansas Highway 18 Business is a business route in the small town of Manila. It connects US 78 and Highway 18 to Highway 77.;History
The Arkansas State Highway Commission created Highway 18B on March 7, 1962 from a former alignment of Highway 77 through downtown Manila. It was redesignated along another former alignment of Highway 77 on June 23, 1965, now running along West Lake Street.
;Major intersections
Mississippi County spur route
Arkansas Highway 18 Spur is a former spur route between Leachville and Manila in Mississippi County, Arkansas.;Major intersections