There is more than one place called Ontario:

North America

• Lake Ontario - One of the Great Lakes, shared by the U.S. and Canada.

Canada

• Ontario - A province of Canada.

United States of America

• Ontario (California) - A city outside of Los Angeles in the state of California.
• Ontario County - A county in the Finger Lakes region of New York.
• Ontario (New York) - a small town in Wayne County in the Finger Lakes region of New York.
• Ontario (Oregon) - a town in Oregon.

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