Where are these wealthy Trump voters coming from anyways? He pretty much lost the vast majority of wealthy counties in this country (often overwhelmingly).
Despite having lost ground with them, Trump still did very well in places like Shelby County, AL, Williamson County, TN, etc. He also did well with high income voters without a college degree, which are more likely to be found in poorer counties.
Basically this. Hamilton County Indiana despite its strong D trend still gave Trump almost 60% of the vote. He also won the wealthiest county in New York, New Jersey, Colorado, Wisconsin, Ohio, Florida, (and I think most states although I haven't checked on that)
Thanks St Alphonso!
Care to pull the wealthiest counties in these states, to save myself some time to see what the data shows for the wealthiest places within those states, assuming precinct/city/township level data is available.... 
Among precincts situated in a census tract with $x in median household income, Trump averaged y percent of the vote:
| Median HH Inc. | Trump % | Swing to Clinton |
| >$100,000 | 38.01% | 11.44% |
| >$120,000 | 36.07% | 15.33% |
| >$140,000 | 34.41% | 18.57% |
| >$160,000 | 32.35% | 20.92% |
| >$180,000 | 30.50% | 22.77% |
| >$200,000 | 30.77% | 24.32% |
| >$220,000 | 29.85% | 28.07% |
Now, due to the ecological fallacy, we can't say for sure that there's a negative individual level relationship between Trump vote and income, but there certainly is one at the precinct level.
