Ontario County, New York

42°51′N 77°17′W / 42.85°N 77.29°W / 42.85; -77.29

Ontario County
County
Ontario County Courthouse in Canandaigua, 2014
Flag Seal
Location within the U.S. state of New York
New York's location within the U.S.
Coordinates: 42°51′N 77°17′W / 42.85°N 77.29°W / 42.85; -77.29
Country	United States
State	New York
Founded	1789
Named for	Lake Ontario
Seat	Canandaigua
Largest city	Geneva
Area
• Total	663 sq mi (1,720 km2)
• Land	644 sq mi (1,670 km2)
• Water	18 sq mi (50 km2)  2.8%
Population  (2020)
• Total	112,458
• Density	169/sq mi (65/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	24th
Website	www.ontariocountyny.gov

Ontario County is a county in the U.S. State of New York. As of the 2020 census, the population was 112,458.^[1] The county seat is Canandaigua.^[2] The county is part of the Finger Lakes region of the state.

Ontario County is part of the Rochester, NY Metropolitan Statistical Area.

In 2006, Progressive Farmer rated Ontario County as the "Best Place to Live" in the U.S., for its "great schools, low crime, excellent health care" and its proximity to Rochester.