About Ontario, WIOntario is located in Wisconsin. Ontario, Wisconsin has a population of 496. Ontario is less family-centric than the surrounding county with 26% households with children. The county percentage for households with children is 27%. The median household income in Ontario, Wisconsin is $45,676. The median household income for the surrounding county is $50,322 compared to the national median of $57,525. The median age of people living in Ontario is 38.3 years. Ontario WeatherThe average high temperature in July is 80.8 degrees, with an average low temperature in January of 6.8 degrees. The annual precipitation is 34.65. Ontario MapOntario real estate officesReal estate near OntarioNearby Cities |