Industry in Ontario, California

After Ontario's founding, citrus farmers in the area took advatage of Ontario's rocky soil, and planted lemon and orange groves. A few groves remain, and the Sunkist Growers, Incorporated continues to operate a processing plant in the city. Vintners and olive growers were also attracted to the area. The Graber Olive House, which continues to produce olives, is a city historical landmark and one of the oldest institutions in Ontario. Dairy farming is also prevalent in the area.

Today, manufacturing is still an important industry (the most notable of which is the Maglite corporation, which produces flashlights), however Ontario's economy is dominated by service industries and warehousing. Much of southern Ontario still contains dairy farms and other agricultural farms, but the area is currently under planning to be developed into a mixed-use area of residential homes, industrial and business parks, and town centers.

The median income for a household in the city was $42,452, and the median income for a family was $44,031.