Interstate 77 (I-77) in the US state of West Virginia is a major north–south Interstate Highway. It extends for 187.21 miles (301.29 km) between Bluefield at the Virginia state line and Williamstown at the Ohio state line. The highway serves Charleston, the capital and largest city in West Virginia; it also serves the cities of Princeton, Beckley, and Parkersburg. I-77 follows the entire length of the West Virginia Turnpike, a toll road that runs between Princeton and Charleston, and it runs concurrently with I-64 between Beckley and Charleston.