What county is Elmhurst IL in

Elmhurst city is located DuPage County.

Members of the Potawatomi Indian tribe, who settled along Salt Creek, just south of the town where they develop, are the first known settlers from the Elmhurst area. Around 1836, European immigrants settled on tracts of land along the same stream. In what would become Elmhurst downtown, an Ohio native named Gerry Bates established a community on a strip of” tree land ” in 1842.

Is Elmhurst in Cook County or DuPage County?
Is Elmhurst IL wealthy?
Is Elmhurst IL safe?
Is Elmhurst a suburb?