State Route 89A (SR 89A) is an 83.85-mile (134.94 km) state highway that runs from Prescott north to Flagstaff in the U.S. state of Arizona. The highway begins at SR 89 and heads northward from Prescott, entering Jerome. From Jerome, the route then heads to Cottonwood and Sedona. The highway is notable for its scenic value as it passes through Sedona and the Oak Creek Canyon. The route then enters Flagstaff, where it crosses Interstate 17 (I-17) and I-40. The highway ends at I-40 Business in Flagstaff. What is now SR 89A became a state highway in the late 1920s as SR 79. The highway was extended and improved several times through 1938. SR 79 was renumbered to U.S. Route 89A (US 89A) in 1941 and then to SR 89A in the early 1990s.
SR 89A runs from its southern terminus in Prescott northward through the towns of Jerome, Cottonwood and Sedona to its northern terminus in Flagstaff. The highway is known for its scenic views as it passes through the Sedona and Oak Creek Canyon.
The southern terminus of SR 89A is located at a junction with SR 89 north of Prescott near the Antelope Hills Golf Course and Ernest A. Love Field. The road heads east from the junction with SR 89 as a four-lane divided highway with diamond interchanges located at most intersections. It continues as a divided highway until it reaches Fain Road in Prescott Valley. The route continues beyond this intersection as a two-lane undivided highway. The only at-grade intersection in this stretch is a junction with Great Western Drive, near milepost 321.
As SR 89A moves to the northeast, it begins to ascend the Black Hills mountain range. The roadway follows the terrain through a series of hairpin turns as it climbs in elevation. Once SR 89A reaches passes over the mountains, it begins its descent into the Verde Valley. During its descent, SR 89A enters the town of Jerome. In Jerome, the highway provides access to the nearby Jerome State Historic Park.
Upon exiting Jerome, SR 89A heads northeast through the Verde Valley. After it enters the town of Clarkdale, it turns southeast at a roundabout with Clarkdale Parkway. The route continues towards the southeast through Clarkdale before entering the town of Cottonwood. There, the highway starts heading east at Cottonwood Street before reaching an intersection with Main Street.