Interstate 81 (I-81) is an 855.02-mile-long (1,376.02 km) Interstate Highway. In the US state of Virginia, I-81 runs for 324.92 miles (522.91 km), making the portion in Virginia longer than any other state's portion. It is also the longest Interstate Highway within the borders of Virginia. It stretches from the Tennessee state line near Bristol to the West Virginia state line near Winchester. It enters Virginia from Bristol, Tennessee, and leaves Virginia into Berkeley County, West Virginia.