Your information source for Ontario economic growth and population demographics. The State of California Department of Finance population estimates for Ontario is 166,134. The city's current area covers approximately 50 sq. miles.
- 2010 Population - 163,924
- 2000 Population - 158,007
- 1990 Population - 133,170
- 2010 US Census Ontario Quick Facts
- 2017 Southern California Association of Governments Profile of Ontario (EDD Data)
Other Census Sources