What is a city in the state of New York and the county seat of Jefferson County, that has  a junction with U.S. Route 11 and NY 12?
New York State Route 12F:  It extends for 6.89 mi from an intersection with NY 180 in the town of Hounsfield to a junction with U.S. Route 11 (US 11) and NY 12 in the city of Watertown.
i don't know