Interstate 565 (I-565) is a 22-mile-long (35 km) Interstate spur that connects I-65 in Decatur with U.S. Route 72 (US 72) in Huntsville in the US state of Alabama. I-565 serves the cities of Decatur, Madison, and downtown Huntsville. It also provides a route to the Huntsville International Airport. The Interstate forms a part of Appalachian Development Highway System Corridor V. U.S. Route 72 Alternate (US 72 Alt.) travels concurrently with I-565 for its entire length.