Trump voters’ median income exceeded the overall statewide median in all 23 states, sometimes narrowly (as in New Hampshire or Missouri) but sometimes substantially. In Florida, for instance, the median household income for Trump voters was about $70,000, compared with $48,000 for the state as a whole. The differences are usually larger in states with substantial non-white populations, as black and Hispanic voters are overwhelmingly Democratic and tend to have lower incomes. In South Carolina, for example, the median Trump supporter had a household income of $72,000, while the median for Clinton supporters was $39,000.

Furthermore:

However, while Republican turnout has considerably increased overall from four years ago, there’s no sign of a particularly heavy turnout among “working-class” or lower-income Republicans. On average in states where exit polls were conducted both this year and in the Republican campaign four years ago, 29 percent of GOP voters have had household incomes below $50,000 this year, compared with 31 percent in 2012.

About 44 percent of Trump supporters have a college degree, compared to 29 percent for the nation as a whole.

That is from Nate Silver, by the way here is my conversation with Nate, transcript, audio, and video at the link.