Watertown International Airport

Trout Creek flows into the Black River near Dexter, New York.

Jefferson County is a county on the northern border of the U.S. state of New York. As of the 2020 census, the population was 116,721. Its county seat is Watertown. The county is named after Thomas Jefferson, third President of the United States of America. It is adjacent to Lake Ontario, southeast from the Canada–US border of Ontario. The county is part of the North Country region of the state. Jefferson County comprises the Watertown-Fort Drum, NY Metropolitan Statistical Area. The popularity of the area as a summer tourist destination results in a dramatic increase of population during that season. In 2014, it elected Colleen M. O'Neill as the first woman county sheriff in the state. She had served with the New York State Police for 32 years. The United States Army's 10th Mountain Division is based at Fort Drum. The base had a total population of nearly 13,000 according to the 2010 census.

Conklin Farm is a historic farm complex located at Hounsfield in Jefferson County, New York. The farm complex consists of a 2+1⁄2-story gable-front double-farmhouse, horse barn, milk house, and garage. Also on the property are the ruins of a cow barn with attached silo and the ruins of a chicken coop.It was listed on the National Register of Historic Places in 1989.

East Hounsfield Christian Church is a historic church located at Hounsfield in Jefferson County, New York, United States. It was built about 1844 and is a two-story, three bay wide and three bay deep, gable front frame structure with Greek Revival features. A one-story wood frame wing is attached to the rear by a small hyphen. The front features a two-stage wood belfry.It was listed on the National Register of Historic Places in 1989.

Brownville Hotel was a historic hotel located at Brownville in Jefferson County, New York. It is a stone structure built about 1820.It was listed on the National Register of Historic Places in 1980. In its former spot, a Stewart's shop now stands after the roof collapsed and building was demolished

Brownville is a town in Jefferson County, New York, United States. The population was 6,263 at the 2010 census, up from 5,839 in 2000. The town is named after Jacob Brown, an early settler and leader. Brownville is located in the western part of the county, northwest of Watertown. The town contains a village also named Brownville.

Gen. Jacob Brown Mansion is a historic home located at Brownville in Jefferson County, New York. It is a stone house built about 1811.It was listed on the National Register of Historic Places in 1980.

Brownville is a village in Jefferson County, New York, United States. The population was 1,119 at the 2010 census, up from 1,022 in 2000. The village is named after Jacob Brown, an early settler and developer. The village is in the southern part of the town of Brownville, west of Watertown.

William Archer House is a historic home located at Brownville in Jefferson County, New York. It is a stone house built about 1811.It was listed on the National Register of Historic Places in 1980.

Arthur Walrath House is a historic home located at Brownville in Jefferson County, New York. It is a stone house built about 1811.It was listed on the National Register of Historic Places in 1980.

Vogt House is a historic home located at Brownville in Jefferson County, New York. It is a stone house built about 1826 in the Federal style.It was listed on the National Register of Historic Places in 1980.

St. Paul's Church is a historic Episcopal church located at Brownville in Jefferson County, New York. It was built about 1820 and is a two-story, timber-framed church built of native limestone coated in stucco and exhibiting characteristics of Federal-style church architecture. It features a prominent steeple that consists of a square base and a three-stage octagonal spire.It was listed on the National Register of Historic Places in 1996.