Interstate 80 runs 311 miles across the width of the Keystone State, from the Ohio border in Mercer County to the Delaware Water Gap bridge at the New Jersey line in Monroe County. It runs through the areas of Clarion, DuBois, Clearfield, Bellefonte, Danville, Bloomsburg, Hazleton and Stroudsburg along the way, and passes through the Allegheny and Pocono ranges of the Appalachian Mountains.