Ontario, California: 34N05, 117W62

Ontario, Oregon: 44N02, 117W02

Ontario, Canada: irregular in shape, but extending from roughly

55N59'38" at its northernmost point (Fort Severn)

42N16 at its southernmost (Windsor)

74W43'02.64" at its easternmost point (Cornwall)

94W27'56.16" at its westernmost (Kenora)