- Southern Terminus:
- Business VA 7 in Purcellville
- Northern Terminus:
- Petersville Road (MD 17) at the Virginia-Maryland state line
- 12.71 miles
Berlin Turnpike is a north/south route in Loudoun County. It begins at Business VA 7, just south of an interchange with Harry Byrd Highway (VA 7). It runs north, passing through Lovettsville, to the Potomac River. It continues across a bridge over the river to Maryland, where it becomes Petersville Road (MD 17).