NOTOC 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.