Welcome to the City of Ontario, one of California's first planned communities. Our City's Canadian founders arrived in 1880. Nourished by their business bravado and engineering brilliance, the City of Ontario grew to become an economic leader in Southern California. Today, growing recognition of the City of Ontario's prominent role in Southern California and increasing importance to the state, national and international economies is greatly attributable to the Mayor and City Council's aggressive economic development strategies, vision and determination to shape events and create Ontario?s future.