Depends on where in the country. But they mostly run the gamut on social issues (i.e. abortion, religious liberty) but are left of center on cultural issues (i.e. immigration). That's why these voters reacted worse to culturally conservative Trump than they did to socially conservative Bush 43.
Also, contrary to popular belief, evangelical conservatism tends to find its base in the suburbs and among the middle and upper middle classes.
As others have noted, this is a broad observation about the socioeconomic profile of engaged/ideological political actors, not a phenomenon endemic to evangelicals. If anything, in relative terms, we would expect engaged evangelicals to be less educated and urban than their counterparts in other religious traditions: