Interstate Highways in Alabama include six main routes, I-10, I-20, I-22, I-59, I-65 and I-85, plus spur and loop routes such as I-165, I-359, I-459, I-565 and I-759. Interstate 65, running from Mobile to the Tennessee line, is the longest at about 366 miles.[1]
| I-10 | 66.27 mi; Mississippi to Florida via Mobile |
|---|---|
| I-20 | 214.78 mi; Mississippi to Georgia |
| I-22 | 96.48 mi; Mississippi to Birmingham (formed 2012) |
| I-59 | 241.18 mi; Mississippi to Georgia |
| I-65 | 366.23 mi; Mobile to Tennessee |
| I-85 | 80.01 mi; Montgomery to Georgia |
Main routes
I-10 crosses the southwest corner of the state for 66.27 miles. I-20 and I-59 run together through Birmingham and Tuscaloosa, with I-20 stretching 214.78 miles and I-59 241.18 miles. I-22 connects Birmingham to Mississippi for 96.48 miles and was formed in 2012. I-65 is the main north-south route, connecting Mobile, Montgomery, Birmingham and Huntsville’s region at 366.23 miles (the article’s introduction gives 367.00). I-85 runs 80.01 miles from I-65 in Montgomery to the Georgia line.[1]
Spurs and loops
The state has several shorter routes: I-165 (4.90 miles) links downtown Mobile with I-65 in Prichard, I-359 (2.30 miles) serves downtown Tuscaloosa, I-459 (32.80 miles) is a partial southern loop around Birmingham, I-565 (21.40 miles, formed in 1991) connects I-65 in Decatur with Huntsville, and I-759 (4.50 miles) runs from I-59 in Attalla to Gadsden.[1] An I-210 designation was created in 1991 and removed in 1994, and I-14 is a proposed route across the state.[1] Some proposed routes, including I-422 and I-685, remain unbuilt or under construction.
Role in the state
The Interstates connect Birmingham, Montgomery, Mobile and Huntsville with the rest of the Southeast, and they carried much of the freight and passenger traffic that railroads once handled; see the railroad history of Alabama. Wikipedia notes that some figures on its page, including I-65’s length, appear in two forms, so the lengths above should be treated as approximate.[1]
Routes in Alabama
Alabama has 11 Interstate routes totaling about 1,130 miles: six primary and five auxiliary. I-65 is longest at about 366 miles from I-10 in Mobile to the Tennessee line, followed by I-59 (241 miles), I-20 (215 miles), I-22 (96 miles), I-85 (80 miles) and I-10 (66 miles).[2]
Spur and loop routes
The auxiliary routes are I-165 (4.9 miles, Mobile to Prichard), I-359 (2.3 miles, Tuscaloosa), I-459 (32.8 miles, a partial loop around Birmingham from Bessemer to Trussville), I-565 (21.4 miles, Decatur to Huntsville, formed 1991) and I-759 (4.5 miles, Attalla to Gadsden).[2]
Changes and proposals
I-22 was formed in 2012, running from the Mississippi line along U.S. 78 to Birmingham. I-210 was formed in 1991 and removed in 1994, now signed as I-165, and I-59B was renumbered I-459. Proposed or unbuilt routes include I-14, I-222, I-422 and I-685.[2]
FAQs
What is the longest Interstate in Alabama? I-65, at about 366 miles.
Which Interstate connects Decatur and Huntsville? I-565.
Sources
More in Transport
Key facts
- I-65 is about 366 miles in Alabama
- I-22 formed in 2012
- I-565 formed in 1991
- Six main Interstate routes cross the state
Quick checkWhich Interstate runs the full north-south length of Alabama?Show answer
Interstate 65, from Mobile to the Tennessee line.
Sources
- Wikipedia. List of Interstate Highways in Alabama. 2025 (accessed 2026-11-10)
Editorially reviewed by Specialty Digest Editorial TeamLast reviewed November 10, 2026Researched and drafted with AI assistanceReport an issue