The Interstate Highways in Arizona are the segments of the Dwight D. Eisenhower System of Interstate and Defense Highways that are owned and maintained by the U.S. state of Arizona, totaling about 1,169 miles (1,881 km).^[1] Arizona has a total of six Interstate Highways, all of which are mainline highways; there are no auxiliary highways. The longest Interstate in Arizona is Interstate 10 (I-10), which traverses east-west through the southern and central parts of the state, serving Phoenix. There are also a total of fourteen active business routes and eight former routes, which were either business loops or spurs for all main highways except I-15. All of Arizona's existing Interstate Highways have overtaken or replaced some U.S. Routes, which either involved decommissioning or running concurrent with the existing route.

The Arizona Department of Transportation (ADOT) is the agency responsible for building and maintaining the Interstate Highways in the Arizona State Highway System. These highways are built to Interstate Highway standards, which are freeways that have a 75-mile-per-hour (121 km/h) speed limit in rural areas and a 65 mph (105 km/h) speed limit in urban areas.^[2] The numbering scheme used to designate the Interstates was developed by the American Association of State Highway and Transportation Officials (AASHTO), an organization composed of various state departments of transportation in the United States.

The Interstate Highway System currently covers 1,169 miles (1,881 km) of interstate highway in Arizona, which only consists of primary highways, which are the two-digit routes and I-8. There are no auxiliary interstates within the state, which are three-digit routes. The only auxiliary Interstate that has existed in Arizona was I-410, which was an inner loop route in Phoenix. It later became part of I-10 as I-10 was rerouted and the old route became part of I-17. The longest Interstate in Arizona is I-10, which spans 392.33 miles (631.39 km)^[1] across southern and central Arizona, and the shortest Interstate is I-15, which only traverses the northwestern corner of the state, running from Nevada to Utah, spanning only 29.39 miles (47.30 km). I-11 is a proposed Interstate that is currently in its planning phase and is expected to run from the Hoover Dam to Nogales. It is planned to overtake U.S. Route 93 (US 93). There are also 14 active business routes within the state. All current Interstate Highways have had business routes except for I-15, which never had a business route designated. I-17's only business route located in Black Canyon City was decommissioned in 2011, joining I-15 as the only two routes without a business route.

All state designated Interstate Business Loops are internally designated as State Route Business Loops by ADOT, being referred to throughout ADOT ArcGIS data and state highway logs as such.^[12] For example, all currently state designated I-10 Business Loops in Arizona are referred to as "SB010" which is the Arizona Transportation Information System (ATIS) code for "State Business Route 10" or "SR 10B" for short.^[12][13]

More information Number, Length (mi) ...

Number	Length (mi)[1]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
BL 8	12.23	19.68	I-8 Bus. at the California state line	I-8 east of Yuma	01966-01-011966[14]	current	Former US 80[15]
BL 8	5.96	9.59	I-8 west of Gila Bend	I-8 east of Gila Bend	01973-01-011973[16]	current	Former US 80 and SR 84[15]
BL 10	2.91	4.68	I-10 west of Quartzsite	I-10 east of Quartzsite	01974-01-011974[17]	current	Former US 60/US 70[15]
BL 10	—	—	I-10 at 27th Avenue in Phoenix	I-10 at 48th Street in Phoenix	—	01990-01-011990
BL 10	5.75[7]	9.25	I-10 and Park Avenue in Tucson	I-10 east of Tucson	01972-01-011972[18]	02001-01-012001[19]	Former US 80/SR 86[15]
BL 10	3.51	5.65	I-10 west of Benson	I-10 east of Benson	01974-01-011974[20]	current	Former US 80/SR 86[15]
BS 10	0.55[7]	0.89	I-10 north of Benson	I-10 BL in Benson	01969-01-011969[21]	01999-01-011999[22]	Ocotillo Road in Benson
BL 10	8.33	13.41	I-10 west of Willcox	I-10 east of Willcox	01974-01-011974[23]	current	Former US 666/SR 86[15]
BL 10	4.41	7.10	I-10 west of Bowie	I-10 east of Bowie	01974-01-011974[24]	current	Former SR 86[15]
BL 10	3.90	6.28	I-10 west of San Simon	I-10 east of San Simon	01974-01-011974[25]	current	Former SR 86[15]
BL 17	3.00	4.83	I-17 in Black Canyon City	I-17 in Black Canyon City	—	02011-01-012011	Former SR 69[15]
BL 19	5.88	9.46	I-19 north of Nogales	Fed. 15 at the Mexican border	01992-01-011992[26]	current	Former US 89/SR 93[15]
BL 19	20.24[7]	32.57	I-19 in Green Valley	I-10 in South Tucson	01992-01-011992[27]	02004-01-012004[28]	Former US 89/SR 93[15]
BL 40	0.55[lower-alpha 1]	0.89	I-40/US 93 west of Kingman	I-40/US 93 east of Kingman	01984-01-011984[29]	02009-01-012009[30]	Former US 66/US 93[15]
BL 40	4.25	6.84	I-40 southwest of Seligman	I-40 southeast of Seligman	01984-01-011984[31]	current	Section of the route is former US 66[15]
BL 40	1.49	2.40	I-40 west of Ash Fork	I-40/SR 89 east of Ash Fork	01984-01-011984[32]	current	Former US 66/US 89[15]
BL 40	3.98	6.41	I-40 west of Williams	I-40/SR 64 east of Williams	01984-01-011984[32]	01990-01-011990	Former US 66/US 89[15]
BL 40	9.67	15.56	I-40 west of Flagstaff	I-40/US 180 in Flagstaff	01988-01-011988[32]	current	Former US 66/US 89[15]
BL 40	0.87[33]	1.40	I-40 BL/US 180 in Flagstaff	I-40/US 180 east of Flagstaff	02002-01-012002[34]	02008-01-012008[35]	Former US 66/US 180[15]
BL 40	3.63[36]	5.84	I-40/US 180/SR 99 west of Winslow	I-40/US 180/SR 87 east of Winslow	01980-01-011980[37]	02007-01-012007[33]	Former US 66/US 180[15]
BS 40	1.20	1.93	SR 99 (3rd Street) in Winslow	Winslow Industrial Spur west of Winslow	01974-01-011974[38]	current	Former US 66/US 180[15]
BL 40	6.83	10.99	I-40/US 180 west of Joseph City	I-40/US 180 east of Joseph City	01984-01-011984[39]	current	Former US 66/US 180[15]
BL 40	15.47	24.90	I-40/US 180 west of Holbrook	I-40/SR 77 east of Holbrook	01984-01-011984[39]	current	Former US 66[15]
Former

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