| State: | AR |
| Type: | AR |
| Route: | 18 |
| Map: | Arkansas 18.png |
| Formed: | April 1, 1926[1] |
| Length Mi: | 93.43 |
| Length Ref: | [2] [3] [4] [5] |
| Direction A: | West |
| Junction: |
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| Direction B: | East |
| Previous Type: | AR |
| Previous Route: | 17 |
| Next Type: | AR |
| Next Route: | 19 |
Highway 18 (AR 18 and Hwy. 18) is an east–west state highway of 93.43miles in Northeast Arkansas. It has concurrency with U.S. Route 78 (US 78) much of its length.
AR 18 begins at AR 69 near Jacksonport. Brief concurrencies begins with AR 17 and US 67 (Future I-57) in Newport, and Arkansas Highway 18S leads to Newport Municipal Airport as AR 18 continues east. The route runs east to AR 37 in Grubbs before turning north at Uno to AR 226 in Cash. AR 18 joins AR 91 and becomes King's Highway.
AR 18/AR 91 run together with US 63 into Jonesboro. AR 18 breaks and runs as Highland Dr., meeting US 49/AR 1. Then later, it meets US 78 where it begins concurrency with. After Jonesboro, US 78/AR 18 meets AR 158 and AR 135 in Lake City. The four routes continue east to Black Oak, when US 78/AR 18 turns north. US 78/AR 18 briefly runs with AR 139 in Monette before continuing east. AR 18B is created in Manila, and US 78/AR 18 meets AR 77.
Both routes briefly meets AR 181 near Dell before turning northeast to Blytheville. US 78/AR 18 meets AR 151 and US 61 in downtown Blytheville. The route continues east to cross over Interstate 55 (exit 67) in a frontage road interchange where US 78 departs from the highway to enter I-55. AR 18 and AR 312 meet briefly south of the Blytheville Municipal Airport. The route continues to terminate at the Mississippi River at the Tennessee state line.
Mile markers reset at some concurrencies.
Highway 18 was created during the 1926 Arkansas state highway numbering from Diaz to Barfield similar to the present-day alignment. The designation was shifted onto Nettleton Cut-Off Road in Jonesboro on March 9, 1955.[6] The highway was rerouted between Leachville and Manilla on July 10, 1957, with Highway 18 taking over the former alignment of Highway 18 Spur.[7] It was extended to Barfield Landing on April 24, 1963, as part of a major expansion of the state highway system.[8] The western terminus was extended west to Highway 69 in Jacksonport on November 23, 1966.[9]
See main article: Auxiliary routes of Arkansas Highway 18.