Union County route The western terminus for AR 172 is at
US 82 near the unincorporated community of
Cairo, or about west of
El Dorado. The route heads northeast, intersecting the community of
Lisbon along the way, before ending at
AR 7 in
Smackover. The route is about long and does not intersect any other highways.
Calhoun County route The western terminus of AR 172 begins at
US 167 near the unincorporated community of
Artesian or about south of
Hampton. The route heads east, before ending at
AR 160 just northwest of
Jersey about later. The route does not intersect any other highways.
Bradley and Drew County Route The western terminus of AR 172 begins at
US 278 east of
Warren. The route heads south, before eventually making a large
U-turn in southwestern
Drew County. The route continues to head northeast, passing through the community of
New Hope before eventually ending at
U.S. Route 425 south of
Monticello. The route is about long and does not intersect any other highways. == Major intersections ==