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The information you want is in the American Fact Finder surveys conducted by the census bereau yearly.
Select by principle city, then the MSA (metro-stat-area)
Table C19001 provide household income breakdown. Here is Ontario and Temecula
You can see that Ontario only has about 10% of the households making over $100K, Temecula has about 25%.
Table B19037 provides the same household income information broken down by age groups. It’s the second table in the above link.