Saint Charles County , near St. Louis , has some of the highest median household incomes .
Others , like Loudoun County , Virginia , outside Washington , D.C. ; northern McHenry County , near Chicago , Illinois ; The Woodlands , outside Houston , Texas ; Rochester , Michigan , outside Detroit ; and Ozaukee County , near Milwaukee , Wisconsin , have some of the highest median household incomes in their respective metropolitan areas.
Commuter town