| Ontario, California |
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| City | | City of Ontario |  The Ontario Convention Center in September 2006. | 
Flag | 
Seal | 
Coat of arms | 
Police seal |
| | Motto(s): Southern California's Next Urban Center[1] | 
Location in San Bernardino County in the state of California | Location in the United States | Coordinates:  34°03′10″N 117°37′40″W | | Country |  United States of America |
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| State |  California |
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| County |  San Bernardino |
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| Incorporated | December 10, 1891[2] |
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| Named for | Ontario, Canada |
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| Government |
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| • Type | City Council / City Manager[1] |
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| • City Council[5] | Mayor Paul S. Leon
Mayor Pro Tem Debra Dorst-Porada
Alan D. Wapner
Jim W. Bowman
Paul Vincent Avila |
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| • City treasurer | James R. Milhiser[3] |
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| • City manager | Al C. Boling[4] |
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| Area[6] |
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| • Total | 49.99 sq mi (129.49 km2) |
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| • Land | 49.93 sq mi (129.33 km2) |
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| • Water | 0.06 sq mi (0.16 km2) 0.13% |
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| Elevation[7] | 1,004 ft (306 m) |
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| Population (2010)[8] |
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| • Total | 163,924 |
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| • Estimate (2016)[9] | 173,212 |
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| • Rank | 4th in San Bernardino County
29th in California
146th in the United States |
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| • Density | 3,468.82/sq mi (1,339.31/km2) |
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| Time zone | Pacific (UTC−8) |
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| • Summer (DST) | PDT (UTC−7) |
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| ZIP codes | 91758, 91761, 91762, 91764 |
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| Area code | 909 |
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| FIPS code | 06-53896 |
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| GNIS feature IDs | 1652764, 2411323 |
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| Website | www.ontarioca.gov |
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