State Trunk Highway 84 was a state highway in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Wisconsin

Wisconsin

Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...

. It ran east–west between Boltonville and Port Washington

Port Washington, Wisconsin

Port Washington is the county seat of Ozaukee County in the U.S. state of Wisconsin. The city is about 25 miles north of Milwaukee and 110 miles north of Chicago. In the 2000 census Port Washington had a population of 10,467...

. The road was turned over to the counties in two stages in the 1990s. The first stage removed the route between Port Washington and Fillmore

Fillmore, Wisconsin

Fillmore is an unincorporated community located in the town of Farmington, Washington County, Wisconsin, United States....

, and in 1992 the remainder was turned back, though it is unclear when the signs were removed.