Arkansas Highway 21
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| Route information | ||||
| Maintained by AHTD | ||||
| Length: | 99.14 mi (159.55 km) | |||
| Existed: | 1926 – present | |||
| Major junctions | ||||
| South end: |
 US 64 in Clarksville
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 US 62 in Berryville US 412 AR 16
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| North end: |
 Route 13, Missouri state line |
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| Location | ||||
| Counties: | Johnson, Newton, Madison, Carroll | |||
| Highway system | ||||
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Highway 21 (AR 21, Ark. 21, and Hwy. 21) is a north–south state highway in north central Arkansas. The route of 99.14 miles (159.55 km) runs from US Route 64 (US 64) in Clarksville north across US 62 to Missouri Route 13 at the Missouri state line The route is entirely a two-lane route with the exception of a brief concurrency with US 62 in Berryville.
The route begins at US 64 in Clarksville near the Clarksville Municipal Airport and runs north to the Ozark National Forest. Highway 21 runs north to intersect Highway 292 near Ludwig and Ludwig Lake near Hillcrest in Johnson County. The route begins a concurrency with Highway 16 until Edwards Junction when Highway 21 turns north and serves as a southern terminus for Highway 43 at Boxley. Upon entering Madison County the highway intersects Highway 74 in Kingston and passes the Bank of Kingston, a property on the National Register of Historic Places. Continuing north, Highway 21 intersects US 412 along the Carroll County line.
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